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Dr. Odin, an octopus scientist, has teamed up with his Dolphin colleague to put a stop to underwater skeletons’ reign of terror!
In this action Tower Defense game, you fend off hoards of skeletons by strategically placing sea creature turrets. Beware that as your line of defense falls, this quickly turns into a game of survival where you dodge around for dear life!

Features

  • Unlock Turrets: Your arsenal is filled with mechanized sea lives! Those cool inventions (such as Pistol Shrimp, Navy Seal, and Death Ray) will handle the fight. You’ll discover new turret types one after another - Figure out how best to utilize each of ‘em!
  • Skeleton Enemies: Did you know that most humans who ever lived are dead? Tons of skeletons end up in the ocean, and are terrorizing local ecosystems. Fight sword-swinging pirates, poison-wielding chemists, and even skeletal dragons… Those skeletons are sure to shake up your playstyle at every turn!

  • Unique Biomes: As you adventure the seven seas, you’ll add more creatures into your turret collection, and face new and exciting dangers. Adapting to changing environments is key to survival: Don’t misstep into a toxic brine pool, or forget your light in the darkness of the deep sea.
  • Turret Upgrades: Skeletons will sometimes drop a variety of Elixirs. Use them to boost turrets into different forms! Will you turn a turret into a frosty ice machine, a powerful mutant, or a shadowy stealth weapon?

  • Boss Fights: Special levels featuring larger-than-life boss enemies with formidable abilities!
  • Awesome Upbeat Soundtrack: Seriously, the composers are amazing
  • Mostly created by one person, while doing college
“The ocean awaits us to reclaim - Let the Operation Octo commence!”
- a message from Dr. Finn the Dolphin (who really needs your help because he’s too lazy to do the work himself)
Operation Octo
Klub Kofta StudioDeveloper
Klub Kofta StudioPublisher
July 2025Release
🎹🖱️ Keyboard + Mouse
🕹️ Partial Controller Support
🎮 Full Controller Support
Very Positive (64 reviews)
Public Linux Depots:
  • [0 B]
Argonaut & The Soundtrack Release

The Soundtrack is Here!

The Operation Octo OST is finally available for streaming / purchase! \n\n You can https://store.steampowered.com/app/4034100/Operation_Octo_Soundtrack/\"" style="color:#bb86fc;text-decoration:none;">buy the OST on Steam , which contains high-quality & loopable versions of each track for download! \n(ft. Volcanic Ridge theme sneak peek?!)\n\n Click here for the YouTube playlist \n\n (The Spotify playlist is currently incomplete, due to distributor delays)\n\nThink of the Steam soundtrack as a tip jar for me, if you liked the game :)\n

\n

New Music for Special Game Modes

\nDaniel Teles has composed some (insanely good) new tracks for Mini-Game Levels & Ultimate Battles (Turret Clam Levels)! \n\nI gave Daniel the \"Crimson Front soundtrack\" as reference for the Ultimate Battle, hence the track has the \"jazz swing big band vibe\" - Go check it out inside the game or the OST now! \n

\n

New Turret - Argonaut

\nWelcome the most complex / unique attacking turret yet - The Argonaut! (i.e. Paper Nautilus)\n\nArgonaut occasionally consumes a nearby Pearl to enhance its attack range - It has 3 forms depending on how far upgraded it is! \nAfter a while, the Argonaut self-destructs and gives ALL the Pearls back!

[img src=\"https://cdn.cloudflare.steamstatic.com/steamcommunity/public/images/clans/44356379/44d29b1e09c93135d779786901c224c97ff6aef6.png\"][/img]

Argonaut is an incredibly powerful yet unreliable attacker (due to its temporary nature) - How good it gets depends on how many Pearls you manage to feed it!

Argonaut fits well into both cycle decks (free full refunds = free cycle!) AND heavy decks (acing at early-game while allowing you to fully transition into expensive attackers using the refunded pearls).

Unlock Argonaut now inside the Sandy Shallows store (Bought for 2 Rubies after you\'ve beaten Level 1-10)! \n

\nIf you encounter any bugs while playing, please report them to me on Discord ! \n\n-------------------------------------------------------------------\n

Balance Changes

  • Frogfish profit amount reduced by 5 Pearls

    [/*]
  • Frogfish has been almost universally thought of as OP since his recent debute. Making a small profit every 20 seconds really adds up over the course of a level, especially when a player intentionally leaves Large Pearls around to be collected by Frogfish. In addition to making Frogfish less of a risk-free & superior Pearl Tree, this nerf essentially degrades the Pearl that a Frogfish produces, so that it\'s much harder to feed Large Pearls that were spitted out by a previous Frogfish right back into a new Frogfish for more profits.

    [/*]

  • A knocked-out turret can no longer give souls to multiple soul collectors (e.g. Hollow Deathray)

    [/*]
  • Hollow Deathray is now only able to collect souls from knocked-out turrets within his attack range

    [/*]
  • Soul-collection has been reworked in preparation to it becoming a more common Hollow turret gimmick, where multiple soul collectors will have to share the limited number of turret K.O.s on the field.

    \n

    [/*]
  • Potion Factory now caps his current HP whenever he launches a potion; The HP cap decreases exponentially after each potion launch

    [/*]
  • This will not impact your interactions with Potion Factory if you\'re attacking him as you should. However, a neglected Factory will now generate weaker and weaker shields as time goes on, to the point that he dies after the 7th Potion launch. When improperly addressed, a Potion Factory will still mess you up, but he will no longer remain a perpetual threat to players who ignore Factories completely.

    [/*]
  • Tangler Skeleton\'s tentacles now automatically retract after 40 seconds

    [/*]
  • Tangler Skeleton ability minimum reload time increased from 6 seconds to 10 seconds

    [/*]
  • I had wanted Tangler tentacles to be a persistent chore you must address sooner or later, and to have illumination play a bigger role when countering Tangler, since tangled turrets that remain unseen could secretly sabotage you for the entire level. However, given how overwhelming & annoying people already find Tangler to be, I\'m now allowing undetected tentacles to eventually disappear. A turret being shut down for 40 whole seconds already accomplishes Tangler\'s role of supporting her current wave. Plus, low-profile, outside-the-base turrets such as Pleco & Starfish are now more desireable picks even when Tangler is present - Even if you can\'t go out of your way to free them, they\'ll now break free eventually. (This also reduces cases where a player thinks his Starfish is in position to counter Potion Factories, but ends up dying horrendously to potions because said Starfish had been tangled the whole time.)

    [/*]

\n

  • While Odin is disoriented and stunned at the same time, if an incoming damage would reduce the disorientation timer low enough, clear the disorientation effect immediately

    [/*]
  • If Odin recovers from disorientation while stunned, Odin now gains an extended disorientation immunity period, starting from when stun wears off

    [/*]
  • More reworks to make recovering from Disorientation less disorientating. Will add some super noticeable visuals for Disorientation recovery next update too...

    [/*]

\n

  • Potion Factory now resets his deployment / reload time when stunned

    [/*]
  • Reaper Skeleton now resets his strike cooldown if stunned while patrolling

    [/*]
  • For consistency with other stun resets, and to provide additional benefit to players who cycle Zappy Jelly onto skeletons camping outside of the base

    [/*]

\n-------------------------------------------------------------------\n\n

Bug Fixes

  • Fixed a glitch where from certain positions, a Frogfish could stretch its tongue across a mountain tile to reach a Pearl inside a Clam

    [/*]

\n

  • Fixed a glitch where Odin\' regen rate could be slowed down when FPS is extremely high

    [/*]
  • Fixed a glitch where Spiky Urchin would not move towards stationary enemies that occupy tiles \n

    [/*]

\n-------------------------------------------------------------------\n\n

Misc Changes

  • A level now ends if all remaining skeletons have been perma-stunned by Crab Trap

    [/*]
  • Graveyard graves now have a button that lets you retrieve all skeleton pods from the grave in one click

    [/*]
  • The shortest Graveyard turret pod charge-up time decreased from 4 seconds to 3 seconds

    [/*]
  • Reordered some Twilight Zone mid-priority Treat Bucket Quests

    [/*]
  • Level 1-11\'s name finally gets censored \n

    [/*]
  • Potion Factory\'s manual entry now displays the \"Gigantic\" trait

    [/*]

\n

  • Removed \"inside a regular level\" requirement from Achievements \"Doppelgnger\" and \"Dolphlocks Irregulars\"

    [/*]
  • \"Good Haul\" Achievement now requires 15 Pearls of profit instead of 20

    [/*]
  • You deserve the achievement if you pulled off double Imitation Crabs during a mini game / Turret Clam level

    [/*]

\n

  • Replaced Mutant Elixir\'s upgrade sound effect

    [/*]
  • im sorryyy gabe i promise it was an accident please dont suuuee

    [/*]

\n

  • Bottle Frost shop item price increased to 10 rubies

    [/*]
  • This has been the intended price all along. Starting Elixirs were always supposed to be expensive ruby items. In the past, players literally had no other buying options to spend rubies on, so I made Elixirs reasonably affordable right off the bat. Now that Argonaut has filled the cheap-gemium slot in Sandy Shallows, Frosty Elixir can finally be sold at the price it deserved to be at. Hurry up and grind for that Mutant Elixir before the Toxic Wasteland gemium comes out next update ;)

    [/*]

\n

  • Changed the \"Place turrets far from skeletons\" pop-up tutorial phrasing from \"A ranged turret will kill a melee skeleton as it walks up\" to \"You could have placed that turret farther back in safety; A dead turret won\'t save your Clam!\"

    [/*]

\n

[ 2025-11-15 20:30:02 CET ] [Original Post]

Minimum Setup

  • OS: Ubuntu 18.04 or higher
  • Processor: SSE2 instruction set supportMemory: 2 GB RAM
  • Memory: 2 GB RAM
  • Graphics: OpenGL 3.2 or higher
  • Storage: 2 GB available spaceAdditional Notes: Unity 2D - Has option to disable shaders
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