I’m glad to see these threads again! They’re fun.

Ash & Adam’s GOBSMACKED (37 Steam reviews)

This is a single-player arcade FPS. You battle robots in a series of arenas with a set of wacky weapons, with shops in between. At the start of each run, you have to buy yourself a starting loadout using the money you got from previous runs, but you can’t choose the same items as your last run. Buying an item for the first time at a shop unlocks it so you can choose it as a starter in a future run.