Good in concept, terrible in game. The game doesn't work as it should in almost every level, even the special stage gets clunky and starts pushing you in random directions.
One of the best Sonic 2D, all the levels in this game has four diferent level designs, with diferent sprites and music, the time travel mechanic is really cool and it makes this game unique in its genre.
Interesting story, the OST is FIRE, cool gameplay, i just didn't like that you have to keep replaying the game to finish it, i know that this is a intentional approach but i didn't like it.