Nice work! The core idea is sort of there, and very apparent directions to go time willing. I think the weapon upsides or downsides need better highlighting at least for the jam, what it's supposed to be doing is hard to parse but I don't think is an issue in general if the intended point is for what the weapon does to be a surprise and screw over the player. 

Buying items with upsides and downsides is a pretty neat idea, just wish I could see what those upsides and downsides are. As far as I can tell there isn't any indication of this? I managed to get to the gold(?) room which I assume is the ending? I found that the character only attacks in the direction you are looking very frustrating, and also kept getting caught on the door when dodging enemies. The sound effects for taking damage being the same for the player and the enemies was a bit confusing, really hard to tell when I got hit, some knockback would also be nice. I like the idea, but can definitely tell it's a bit rushed.

Pretty nice game! Great polish with the sound effects, and also the shop system but I do feel like the gameplay feels a bit repetitive. Maybe more upgrades and also varying attacks can make it more awesome! But still, good job!