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Not far in the future. 

'ZUBR' organization develops nano-insects to infect humanity. Two experimental cats Thom and Hunt run away from the laboratory to disturb them.

Let's help cats save the world!


✜ - Move  | A - Jump | B - Shoot

Download the ROM file and run it by an NES emulator ( Mesen ).

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Updated 3 days ago
PlatformsWindows, macOS, Linux, Android
Release date Feb 05, 2022
Rated 5.0 out of 5 stars
AuthorPB Games
GenrePlatformer, Shooter
Made withPiskel
Tags2D, 8-Bit, Cats, NES (Nintendo Entertainment System), NES ROM, Pixel Art, Retro
Code licenseMIT License
Average sessionAbout a half-hour
InputsKeyboard, Gamepad (any)
AccessibilityColor-blind friendly, Subtitles, Configurable controls
MultiplayerLocal multiplayer
Player count1 - 2


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Click download now to get access to the following files:

Biocats 358 kB

Development log


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Can't play the rom on Super Retro-Cade (it runs other new NES roms). I see only solid grey screen. Any idea why?

Hi, LukaszKowalczuk! Try to change mapper for from by iNES Header Checker.  Maybe it will help ) 

Thanks, will try!

(2 edits)

Also, several life energy hearts can be exploited like that third key. I noticed this a lot in the 4th stage. 

Sometimes the area's load screen gets stuck. There seems to be variable load time. A few times I've just loaded a save state because it doesn't seem it will make it through. The screen for the finale stage locked up twice. I'm playing using the Mesen 0.9.9 core in RetroArch. 

Is it intentional there is no indication how many lives you have? Once I got to the 5th stage death was permanent, and I wasn't sure if that's just a function of being in the enemy's main headquarters or if I had a certain amount of lives and had lost my final one.

(Great game btw! Just reporting the bugs so you can get them out.)

Hi! Thanks for the feedback. We have already fixed these problems with keys and health pickUps, reworked the logic a bit. Please download the updated version of the game.

PS: cats have 9 lives, as in real) 

(1 edit)

I love the game so far! Not sure if it was intentional, but the first key can be exploited (it reappears if you return to that screen). Edit: Correction, 3rd key

(1 edit)

I really enjoyed playing this game and I finshed all the levels! That's great that the game has a storyline, some introduction before each level with nice arts and in-game messages, it makes much more interesting to play. That music and picture creates nostalgy atmosphere. Each level in the game looks different and great designed! Here are some screenshots (please ignore emulator error, same key mapped to screesnhot and load state 9):


Thank you for the comment, Jovch! And thanks for playing 😊 

(2 edits) (+1)(-1)

This game shows promise but this feels like an incomplete and buggy build. If you press start too much during the intro cutscene, the nametable and attribute table get corrupted.

I was asking a few more people in the NESDev discord and they reported similar problems in other emulators, including the recommended Mesen.

This happened using an everdrive n8 pro, OS version 2.12, with G revision PPU and CPU on a famicom motherboard HVC-CPU-07:

Not obviously a bug, but from a game design perspective, it is awkward that key counts don’t reset after dying and that keys respawn after entering, leaving a room. Way too easy to get infinite keys.

After clearing what I assume is “level 1”, I was softlocked in this screen, with my character spinning around in the middle of it, and no further inputs worked.

If the developer can debug the game, this looks like it could be a fun platformer.

(1 edit)

Hi JordiGH!

Thanks for the comment. Yes, it is our ( my brother and my ) first game so there are some bugs ><. But we hope to fix all that we can.

PS: pause bug is fixed already)