I found this to be quite a challenging game. I had no idea it would be that difficult. I think it's just because you have to control two different characters and never at the same time. The fact that you did not make it a side scrolling game made it even harder. With all that said, I did like this game.
I thought only the red guy could collect the red keys. Why are they even different colors? The sounds were nice and subtle in this. It seems strange how only one guy can collect stars. They should be red to make more sense.