I like that game. Turn-based racing is an interesting concept to me and this game enhances it with the boosts from Match3. The Match3 part isn't as fun, but it has its place there because it generates turns and boosts.
The Match3 part needs to be redesigned, because some symbols are hard to distinguish, especially the flags. The game needs multi-lap races, otherwise, there is no point in that the track is a circuit. It needs also more tracks, larger tracks, and better opponents; the hard one wasn't hard IMO. If you create a game that is like this but larger, I will play it.