It may just be me, but 5j seems a little glitchy, i've had the ball get stuck in the vertical wall while falling down, it got caught bouncing in the corners of two angled walls and rebounding the wrong way in that inverted S Shaped tube.
Secret Trick: after purchasing Superman, pressing Right+Right+Up you do a front superman, 50 points more than the regular and good for boosting your combo.
It's a great game, though, olddudeman is right, towards the end, with maxed 100 army of Zombie Heros, i still lose 30~50 zombies each round, having to click it back to 100 is a bit of a nuisance
Hahaha, didn't think about that :)