I'm really not sure what the point of the game really is. Sorry to say but I couldn't really get much excitement out of it. I can see that you put work into it though. I think that there should be more enemy variety and if you really want it to be fast paced the music should be more up beat rather than mellowed out and more lofi. Maybe add some different weapons. Also I am not sure what decay does I just sat in the room for a while and got it really high and it didn't do anything. I'd love to see where you go from here it is a good start.