Great animations, great gameplay, great level design. 

The enemy design here is great, it's a hack and slash, but it takes some strategy to be able to defeat the enemy. Especially in the later areas.

The single boss in the game surprised me by how well designed it was. Challenging, but not unfair.

The levels are quite expansive, you can find little secrets and bonuses if you explore enough, and many levels have multiple routes to get to them.

And finally, the art in the game is fantastic - very high quality and more animations than I expected.

Great experience, can't wait for the full version.