Cool game! I really liked how you start off without any guns, then must retrieve one by punching one of the enemies! The concept was also well executed. I think after retrieving a gun, the game does become quite repetitive and samey. I would be riding the elevator up then shoot down the entire hallway to kill everything, then do that a bunch more times. I noticed the map is randomly generated a bit? Not too sure how it works but I think having some more variety in the level design could help with the repetition and make me use my movement more to dodge enemies and get better angles to shoot.
I also noticed there were some sprite layering issues, where some objects would appear in front of the player rather than behind. You could probably fix this by putting your objects on many different layers that all appear behind the player. For example, you could have these layers: BG -> midground -> decoration -> ground -> player, where player is the top-most rendering layer! This could help with organizing the objects to get your game to look exactly as you'd like!
Overall, you've got a lot of content in just a few days, and the combat is quite fun! I also liked the round, legless player character lol. Congrats on your submission!