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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]
Patch 1.3.1 - Everywhere Eel Bug Fixes

So many new bugs from just one minor update \n\nIf you encounter any bugs while playing, please report them to me on Discord ! \n-------------------------------------------------------------------\n\n

Bug Fixes

  • Everywhere Eel no longer leaves behind a \"fog-of-war ghost\" after teleporting in the dark

    [/*]
  • Reported by IdiotWithATophat

    [/*]

  • Fixed a glitch where upon restarting a level, skeletons could become able to walk through specific boulders on specific maps

    [/*]
  • Reported by eagle

    [/*]

  • Fixed a glitch where Lionfish spikes draw long trails across the screen the moment they appear

    [/*]
  • Reported by IdiotWithATophat

    [/*]

  • Fixed a glitch where Migrating Jellies in Level 3-5 \"Graveyard Shift\" could visually face wrong directions

    [/*]
  • Reported by LameGamerTime

    [/*]

  • Pearl Tree can no longer be upgraded after it has started bursting pearls

    [/*]
  • Fixed a glitch where Spiky Urchin can pathfind through turrets or mountains when moving diagonally onto an empty tile\n

    [/*]

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

Misc Changes

  • Extra duplicated Everywhere Eel upgrades no longer drop Elixirs when killed by Reaper Skeletons

    [/*]
  • Suggested by eagle

    [/*]

  • Imitating an Everywhere Eel using Imitation Crab no longer earns you the \"Doppelgnger\" achievement

    [/*]
  • Suggested by eagle

    [/*]

  • Everywhere Eel now duplicates when a Graveyard simulation starts

    [/*]
  • Suggested by LameGamerTime

    [/*]

  • Voyager Manual now displays Everywhere Eel before Frogfish

    [/*]
  • Suggested by IdiotWithATophat

    [/*]

  • Slightly modified manual descriptions for Everywhere Eel\'s forms

    [/*]
  • Life drain mosquitos now display at an offset on certain skeleton types

    [/*]

[ 2025-12-24 12:14:09 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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