Crazy good game! Really nailed it on the whole gravitation gimmick, very intuitive in action and gives the player so much freedom!
The boss is cool, but phases transitions a little rushed and not really noticeable. The weapons eschange is a little unnecessary and weapons are really similar to one another so the "charges" could be done a little smarter in the game designing sense (maybe ammo or charges for the blade?).
But the art is good, boss even if it only one here is super polished and game is really, really fun! Great job!