Very stylish! Everything looks so great and feels so great. Seems like lots of polish in the mechanics, for a jam game especially!
Obviously, the bug with losing the upgrades is an issue, especially if you're as terrible at games as I am. I see that you seem to already have it fixed, so I'll have to remember to come back to this one when the jam ends; I want to play more, but I'm just too terrible!
Overall, however, the game really is very cool and very well done in general. Excellent work!