This is really really good for a 7 day jam game, solid controls, pretty good music, if I had any thing that I could point out as the weakest part of the game it would be the enemy sprites but it's such a small part of the game I really didn't care at all, all of the other visuals are really great as well and getting upgrades felt pretty satisfying picking up the enemy drops.
I was a bit disappointed to see no end boss but that's just because I was enjoying this so much like it was an actual game, the best game I've played in the jam so far for sure.