This game is off to a great start! Graphics and animation are top-notch. I played with a gamepad, and had no issues with the controls.
The MC's speed seems really, really fast, though I'm more used to movement in games like Castlevania. The flying enemies were a bit annoying to deal with, especially the fairies cause they run away a lot.
As for level design, there were a few places where you had to make blind jumps. Also the area with the water looked like it had no floor.
Overall though, pretty fun demo. Also the character designs are very cultured.