Ahh, I see.

Are the maps created manually or are you using an algorithm for creating random maps?

I can't see any "obvious flaws" in your game at the moment. It's simple and yet entertaining (at least judging from the video).

One could add more tile types (non-rotatable tiles for example) or more item types (coin bubble thingies that give more points or something like that). Or one could have different colored coins distributed over the map and the player gets a higher score by connecting adjacent tiles that hold coins of the same color. Dunno whether this would work gameplay-wise, though.

Apart from that I can't think of any more suggestions currently.