Nice game overall
Feedback if you care about that:
The giant purple guys literally never pose any threat whatsoever and are boring to fight against, they were never mixed with other enemies, they are slow, and they don't even shoot projectiles, so they basically add nothing to the game in their current state.
The slippery floor in the last level probably should be introduced in a safer room before you make the player walk in that dangerous path, right now I think it will lead to most people running straight into their death the first time lol
The room with the two elevators with glass around their buttons can get you stuck if you press the buttons while standing below the glass
The third level seems to have a problem with the way it triggers the doors in the room you can get the plasma rifle weapon, I killed some of the enemies once from the left uppermost spot you can access through a secret wall instead of from the room itself and for some reason it didn't trigger the other enemy closets in that room