The undead never stop coming… but neither do you!
Mow down relentless hordes of zombies with wild weapons, devastating skills, and game breaking synergies in this fast-paced bullet heaven survival game crafted by a solo dev. Whether playing alone or teaming up in couch co-op, every run is chaotic, challenging, and full of surprises.
10 Survivors - 60 Skins
Choose from 10 unique heroes and collect over 60 skins to customize your survivor.
60+ Skills
Customize every run based on your game style, you can find anything you want! from critical chance builds, to lifesteal, summoning and more! Combine 28+ passive skills with powerful synergies to create game-breaking builds and unleash carnage your own way. Every run is different!
2 Players Couch Co-op Chaos
Double the firepower, double the mayhem! Team up in local couch co-op and fight side by side in the ultimate test of survival. Work together to create devastating builds, cover each other’s backs, and see if you can outlast the swarm!
5 Unique Scenarios
Five unique scenarios with their own mechanics, a gripping story on surviving the apocalypse.
30 Collectibles
Uncover 30 unique collectibles that reveal the events leading up to and during the apocalypse. Each one adds a piece to the puzzle of what really happened.
The Enemies
Face relentless hordes of Zs, but beware the Alpha Zs:
Sneaky – Silent but deadly.
Fatty – Slow, but explosive!
Fast – Quick and relentless.
Tanky – Tough and hard to take down.
Goliath – A force of nature that few can defeat.
This is just the beginning. As a passionate solo developer, I’m committed to delivering frequent updates with new heroes, weapons, skills, enemies, modes, and more, all based on your feedback! let's grow together!

macOS Warning: If you see a compatibility notice, the game still runs on macOS 10.15+ but is not notarized. You may need to allow the app manually in System Preferences → Security & Privacy.
Full Description:
Whats New in v1.2:
Gameplay & Balance
Special Zombies now have higher max HP early-game, making them a real threat from the start.
[/*]Goliaths HP has been increased for longer, more intense encounters -> feel the tension!
[/*]Enemy XP gain slightly reduced for smoother progression without overpowering early runs.
[/*]
Visual & Feedback Improvements
Blood splatter now has more realistic force and drip momentum for melee attacks.
[/*]Explosion effects improved for better visual clarity.
[/*]General zombie graphics enhanced for more immersive combat.
[/*]
UI & Quality-of-Life Fixes
Corrected controller navigation in Upgrade and Loadout menus.
[/*]Added background image to pre-game menu.
[/*]Slightly increased shotgun damage.
[/*]Roll/evade distance increased for smoother dodging.
[/*]Active skill use now triggers subtle controller vibration feedback.
[/*]Controller image updated to match latest changes.
[/*]Fixed third active skill UX issue now correctly maps to R3.
[/*]
Gameplay Decisions
When moving to a new map in the same run: all player build resets except gold, which now persists at 50%.
[/*]Skills and synergy progressions are maintained during runs, making your strategic choices matter more.
[/*]
New Content
Added 7 new melee weapons to expand build variety and close-range playstyles.
[/*]
Gameplay Improvements
Reworked the XP and level-up curve to feel smoother and more rewarding.
[/*]Adjusted Zombie spawn rate now scales properly with each wave for better tension and pacing.
[/*]Improved fire-rate upgrades, now capped and controlled to avoid unintended extremes.
[/*]Updated Zombie HP curve during runs for more consistent difficulty progression.
[/*]
UI & UX
Fixed the Game Over screen layout issues.
[/*]Improved Player UI and overall UX, making information clearer and easier to read during hectic runs.
[/*]
Economy Adjustments
Decreased the base price of upgrades, making progression more accessible.
[/*]Improved EVO point acquisition, making evolutions smoother and more achievable.
[/*]
Thank you for playing and supporting the project, every update is getting us closer to the full vision of ZK1L4.\n\nAs always, keep the feedback coming, and happy surviving!
Hi everyone!
Santosai here! This update focuses on polish, balance improvements, bug fixes, and making every run feel more dynamic and rewarding. As a solo developer, Im incredibly grateful for every bit of feedback, this update is the first step in making ZK1L4 even better for you.
\nHighlights of v1.1
New Improvements
More dynamic skill selection screen (visual effects + feedback). Better readability in UI and improved clarity in stats.
[/*]Added Version label in main menu.\nChanged global points used for Upgrades/Shopping from Currency to Evolution Points
[/*]Added 5 new guns\nAdded a new Z: Gold Z which has tons of HP but upon defeat gives great rewards
[/*]Added a new starting gun: Uzi
[/*]
Balance Adjustments
Decreased general Z damage in early game
[/*]Gold rewards are now more consistent and fair.
[/*]Passive skills rebalanced to create more exciting synergies.
[/*]Early-game and mid-game pacing improved.\n
[/*]
Visual Upgrades
Better glow effects on buttons.
[/*]Enhanced GPU particles for interactions when acquiring a new upgrade.
[/*]Smoother transitions during level-up and upgrades.
[/*]Improved loading screen graphics.\n
[/*]
Bug Fixes
Fixed audio issues where some sounds wouldnt play on level-up.
[/*]Fixed inconsistencies in skill cost calculations.
[/*]Improved an issue in which currency could be negative.
[/*]Improved menu navigation at Main Menu \n
[/*]
Thank You!!
\nThank you for playing and supporting ZK1L4!
Im a solo indie dev, and every update is built with love.
Your feedback keeps this project alive, and more updates are already on the way.
If you enjoy the game, leaving a review or sharing it with a friend helps a LOT!
Stay safe out there the zombies aren\'t slowing down.
ZK1L4 has already reached players across the world!
I just wanted to say a huge thank you to everyone whos joined the fight for survival so far, it means a lot to me as a solo developer.
Im currently working on performance tweaks, new passives, and a few surprises for the next update.
Every wishlist, bit of feedback, or shared screenshot really helps this world grow.
Stay alive out there, survivors.
Hey everyone
After a full year of solo development, I can finally say it:
ZK1L4 is out now on Steam!
This project means a lot to me. I built it during late nights after work, and even through the uncertainty of being laid off. There were moments when I couldve stopped, gone out, rested, or waited for a better time, but instead, I chose to stay home, focus, and keep building.
Every pixel, sound, and mechanic became part of a personal mission: to prove to myself that I could bring a full game to life, no matter how long or hard it got.
ZK1L4 is my love letter to post-apocalyptic survival games, a bullet heaven where chaos turns into flow, and small victories feel huge. Youll fight waves of the infected, unlock passives and weapons that evolve in wild ways, and test your endurance against rising odds.
Whats inside:
Fast, skill-based combat that rewards precision and movement
Over 25 passive skills and countless synergies to discover
A mix of melee and ranged weapons.
Randomized drops, increasing waves, and escalating difficulty
Light strategy through XP, gold, and resource management.
---
ZK1L4 isnt just a game, its proof that no matter how uncertain life gets, creativity can be your anchor.
If even one person finds joy, peace, or excitement playing it, then every long night was worth it.
I\'m committed to provide constant updates and improvements, this is my first step in building a \"cinematic video game universe\" with more titles to come!
Thank you for checking it out, sharing it, or simply reading this far.
Youre part of what made this possible.
Play or Wishlist ZK1L4 on Steam: https://store.steampowered.com/app/3635000/ZK1L4\"" style="color:#bb86fc;text-decoration:none;">ZK1L4 Steam
Lets survive together.
David
Minimum Setup
- OS: Linux distribution released after 2016
- Processor: Intel Core 2 Duo E8200. AMD Athlon XE BE-2300. Raspberry Pi 4Memory: 2 GB RAM
- Memory: 2 GB RAM
- Graphics: Intel HD Graphics 5500 (Broadwell). AMD Radeon R5 Graphics (Kaveri)
- Storage: 1 GB available space
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