Wow, I love rhythm games and this game is no exception, very fun! I love the art, and the details too, like adding the wobble to the speakers on the last level. A bit more polish would go a long way, but nevertheless the game is great! :D
I think mostly like the menu screen and shop screen could be more stylized, instead of using flat colors, and maybe rearranging some UI. To be fair, this is just my opinion, what you have already is good, especially with the jam limitations. :)
Ok I see, thank you for elaborating! So you just mean the underdeveloped/unfinished areas could use some time in the oven? Or was there anywhere that felt messy that could use some corners rounding off?