The animations and music in this game are the best I've see so far. The idea is also very cool. It took me a little while to work out that you could dash diagonally. It is also very cool that you have implemented a save game state.
Main feedback for me was the controls were a little awkward. I am use to playing games with the arrow keys so would have been good if you had alternative controls for those use to the arrow keys.
Really awesome job overall :)