I was rooting for this project when you showed it at the discord channel, and in the end it's really good. Clean graphics, responsive controls, nice level design.
Only two problems. Sometimes the sword would fly in slightly different direction than I'd anticipate (not straight at the mouse cursor).
The other is less of a problem and more of my personal preference. I like, when in platformers up is not jump. For example space.
Really cool game, keep up the good work!