The visuals look Nice, especially the title screen. There doesn't seem to be a reward for completing a stage, and upgrades are quite expensive. That's normal for a roguelike, but maybe make it easier for jams game. Still, Great work!
you're right, there aren't any rewards for completing a stage (except for the souls you gathered + new stage), I should look into that making the playing feel rewarded for completing a stage. Thank you for playing!