I beat it! Though I was sad when the level just wrapped to an earlier stage.
Really impressive, looks really good, it's really cool you have so much content here.
The controls/physics feel really bad, and the background would frequently glitch out a bit, showing seams. I'd often get stuck on the side of platforms, and a lot of the time the platforming was really frustrating. The level design needs work, you're just asking the player to jump down not knowing where there's spikes and not. It becomes more just trial-and-error, memorizing the stage than any kind of learning or mastery, which isn't very fun. The sword feels really stiff, bad, and awkward. Dying at all feels weird, the animation is so slow and anticlimactic.
The game feel in general has a lot of room for improvement, but again it's so impressive that you have this fully featured and fully functioning of a game with so many levels! Nice job!