Ahh, this was a really cool idea! I really loved wildly swinging the knight around my mouse.
I feel like the game was trying to go in two directions at once that were a bit at odds with each other, with one a focus on precision with careful movement and the other on causing chaos. The movement of the knight was really erratic, which often meant that I was waiting until the knight happened to swing into the right position. I'd love to see a game that hones in on one of these two aspects-- maybe the knight could act more like a wrecking ball that you slam into enemies?
I think you did a good job with having the levels build progressively off one another too, which helped build the challenge up.