Fun... until my comp crashed.
Honestly, I liked the game. It was interesting, and there were many ways of beating a level, even if you didn't get the star point, if you manipulated the game enough. I thought that aspect was appealing, because often times in math there's more than one way to do things also, and those ways aren't necessarily wrong either. I love puzzle games, so combined with the ease of the controls (click + drag,) cute graphics and catchy little tune, I thought it was pretty entertaining.
My biggest peeve is that (as far as I know) your progress isn't saved? I was on one of the last few levels, and my computer froze, so I had to restart. Lost all my progress, as well as all motivation to beat the game. If you could add a save feature, or better yet and automatic save-feature, I would have liked the game better. Sometimes people can't just sit down and beat 45 levels all in a row.