Good puzzles
It was entertaining for a few minutes but it gets boring after a while.
Nothing noticeable that needs to be improved, but the music moves at a different pace than the character and so if you don't have it muted it gets really hard to keep up with the tempo. That, and better graphics. The blocky-look works fine, but it's not very appealing. So all in all, some better aesthetics would pretty much make it perfect.