The game is good, the sprites are incredible, the mechanics are cool and the movesets are easy to learn, but the mobile controls are not at all interesting, confusing and poorly placed, the physics are questionable at times, Sonic bugs out in certain parts, and the lack of background music is a negative point in this fangame, but ignoring that, it's a good fangame, but not the best yet.
(Edit:I forgot to say that Miku's sprite doesn't appear)