I can smell the Superhot inspiration, and you've done a good job with it. The weapons feel good, and the glass aesthetic is satisfying.
I actually didn't mind the mouse movement that much, but I don't see why it's necessary. There's a reason why WASD + mouse is the norm. It's natural. Even Rocket League, which has no business with mouse movement at all, preferred to use WASD + mouse for its default input scheme.
I personally find picking up items a bit awkward (just a bit, not a major issue). Have you tried auto-equipping?
Overall, solid entry to the jam!