For the controls,maybe try left mousebutton for clockwise and right mousebutton for anticlockwise rotating. (just an idea).
I don´t think that they soundfx are to loud, but they are not supporting your game very good (my opinion). I think you will find more and better sfx if you invest some time for searching.
Oh one more thing. I had the feeling that there is not enough time specially if you are new to the game. I only was able to collect a few gemgroups, and then the time was over very quick.Anyway, all in all i like this game and the idea. The result could become very interesting if you do it right.