I encountered a bug while playing. When I started the actual game, the sound and mouse senstivity settings were set to 0.
It was not clear to me how I would defend myself against the bugs. I just died. On my third attempt, I figured out to press 1 to get my weapon.
I like the retro filter you are using for the visuals and I like the idea of what you are trying to achieve. I am just not good enough to beat your game.