I loved both the art and the gameplay, though I think some of the animations and sprites of the main character are a little weird (i.e. the way his knees bend when his back is towards the camera). If the difficulty of the first boss is any indication, it will be a good challenge when it finally releases. Good luck!
Edit: Forgot to mention that it crashed two times. At first I thought it was a problem with my PC, but when it happened again I had moved to my laptop. It wasn't anything that would make me quit the game, but considering it was a 60m demo, I think it would be worth checking if it was just a freaky coincidence or an actual problem.