A friend of mine told me that VVVVVV was a very difficult and fun game that he played on his iPad so I found it on kindle and couldn't resist it so I just bought it. I was not disappointed... the controls are not too bad, there's a good selection of them anyway. Great solid gameplay, and brilliant retro music perfect for the game. There are also some good player worlds if you have finished or are bored of the main game, so those are quite fun.
So overall I personally think that this game is a very, very good game.