I think it's nice and cute, and I believe that's what the submitter was going for. If you look at this game as a "Family-friendly" game, I think it fits into the Theme in a way. It works, the controls are good, the music is simple and I enjoyed it.
I will say that there are many different kinds of games like this, so it's not exactly original. I also wish there were forward and back controls so I could collect all of the cards (or gems).