Playing this now. I’m loving the style, and the old computer sounds.
I dig the concept of only having one shot, and the aim feel pretty good so I don’t mind it. If you’re decent at FPS game, this doesn’t feel too overwhelming. I did get hit in the back a few times by things I didn’t know were there. Maybe the enemies could make a sound as they move around.
I like your upgrade system, there is a lot here for a jam game and you should be proud! Good work and good luck.