Man, CPU 4 got hands!
This is quite a fun game, and runs great on Linux & Steam Deck (with Steam input mapped to buttons) too; thank you for providing a Linux build as well!
The different stages are neat and I was surprised at the mini- Super Meatboy in there as singleplayer content!
One drawback for me; keypad Enter and Space to attack feel odd, maybe it could be possible to introduce button mapping settings if that's not too much to ask (I'm not very good with Godot yet but this seems like a good tutorial for that, maybe that helps?)