Very fun little game, I had a little trouble with the controls, because i usually play with WASD and Space, but maybe the engine can´t do these keys. I also liked the art-style and the idea, kinda reminds me of squirrel with a gun.
I definitely think I could have remapped the controls to something more familiar, because you're right. Most players use WASD and space. I will check if spacebar is supported (it should be). Thanks for the feedback and playing my game! :)