Love it, the music is especially good, the mobs feel alive. I think an upgrade progression bar would be really nice to have (how many stars to go), and some kind of heal drop to get you back after a misstep.
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Thank you so much for the comment! Hope to get your rating once it opens up for voting.
There should be the experience bar (some resolutions might f up the positioning a bit), but you are right that it doesn't show the amount you're still missing, just a bar that gives you some estimate.
We thought about the heal drops, but wanted to have the difficulty so that it might take few tries to get through level 1 to the boss fight. Also some replay value with having to try with different powerup combinations.