This is a cool little project. The art is nice as others have said and it's cohesive, music is nice too.
I really liked the direction you're taking the movement, though it could do with some fine-tuning maybe, and being able to swing in mid-air would be great.
Also a little bit more direction could go a long way, like an indicator of how many more enemies need to be killed for this phase, etc. (like maybe start with ~20 skeletons on the ground, then as an enemy spawn one gets removed, it could be visual feedback that the player is progressing, just an idea)
Overall this is cool, good job and congrats on your first game jam submission!