I was really surprised by the speed at the start of the game (definitely made me laugh at first). By the time you get used to it, though, it can feel really good. It really grew on me the more I played. I do wish there was a little bit of magnetism on the potions/upgrades, though, since (given the speed at which you move), it can be hard to line yourself up precisely with them.
Combat ends up being frantic but very fun, though i wish I had a bit more control over where my sword was going (at times, I knew where I wanted it to be but I couldn't figure out where my cursor was to orient it in the right direction). To me this feels like it wants to use twin-stick controls with a gamepad, which I think could feel really good. The upgrades feel good, too.
Music and art are killer (the protag here might be my favorite sprite of the whole jam). My only critiques graphically are that I feel like there's opportunity to juice up enemy hits/kills. The biggest place I felt this was when I died; when that happened, the transition back to the start of the level was fast, which is great for diving right back in but was kind of startling. I think a quick death animation and fade or pan or something would help make that transition less jarring.
Sorry for the nitpicks. To be clear, I really liked this game! I had a blast playing it. Great work!