Your game deserves all the time spend on it. It is just as hard it as to be, so it is enjoyable... Even if some levels are harder to finish :)
Edit: As I unlocked set 3 by finishing 8 levels on set 2, I saw you made some levels which are really hard, especially with the bouncing tiles... What a neat idea :D
I fear what new trick you add to the last two sets of levels... I don't wanna know for now!