The instructions are quite unclear. I was collecting the gray balls when I touched an enemy and I was losing health so I thought it was bad. Also, when touching a power thing, I was randomly gaining and losing health and power because I wasn't sure what I was doing. Also, the ball collecting minigames take a bit too much time. It should be faster. Finally, there doesn't seem to be any goal of any kind. Add a storyline or something so the player has something to strive for.