Not enough extra lives.
Fun game, but I only gave it an 8 rating because there are not enough extra lives in it. I got to level 8, and during that time I found a total of 1 extra life. You have 15 lives to start, but, they do run out over time. Once your lives are out, you have to go back to an earlier save(with few lives left anyways) or start the whole game over. So i gave up on it after a while. You should put in more extra lives, a lot more. Mabye 1-2 per level, not none until level 7. If you think that would make it too easy, make it so you only start off with 3 lives, not 15.