The tutorial felt more like it would be a puzzle game, not boss-fighting :) It was pretty hard, but I suck at this kind of game, so I barely managed to pass this first boss :)
The movement is a bit clunky - it would be nice to have a smoother curve for a jump. Also I'm not quite sure it is a good idea to wait for the hammer to hit or go off-screen to fire again - it doesn't look like a boomerang, so I'm not sure why I hit more often from nearby than from afar?
That said - nice submission and cure art! :)