That was a really solid fun experience. Aside from the occasional freezes (I noticed your thing about the accelerator), it didn't feel clunky, and the buffs felt reasonable instead of OP. I didn't stack double doors so maybe that's why. I guess I was afraid they wouldn't stack like that. I think having more feedback for when I get hit would be useful. A camera shake and/or quick color change could help with that.
I saw in your devlog that you were considering making this into a fuller game. I think you have a good foundation for that.