I didn't expect to catch myself playing this that much to be honest.
Graphics aside, the game was actually quite addicting, once I got the hang of the basics. I like how fast-paced it feels. Maybe adding an option to skip fights altogether (and just see the results) would make it even more fast-paced.
I also really dig your shop graphics. They are so simple, yet convey their meaning very well.
I didn't make it long above level 25 enemies though. The game does have a pretty high difficulty curve (or I'm just dumb, which very well might also be the case). I think giving the player a way to recover their health would be beneficial (maybe consumables like potions? Sorry, I don't want to add even more to your feature creep 🙈).
What the game needs the most now (I think) is more player feedback, both visually and auditory. I like the animations you got going on in the battles but I was very confused the first time I encountered a fight. Mostly because I ran straight to the boss and got abolished to dust, but also because I didn't get much information on what was happening.
Oh and some closing thoughts: You submitted your game to the jam (and participated for the 10th time, which is crazy dedication). Congrats! That's far more than most other people are willing to put up with. No need to apologize on the jam page about how broken the game might be. It was/is a jam after all, I hope you had a great time during it.