I agree, Adding a pause button would be good, Also i have a problem with the fact that when you are actually slightly bigger than a planet it sometimes does'nt let you, "Eat" or absorb it and you have to restart the level. Although apart from that good game, I'm really desperate for a sequal.
I enjoyed it, I really liked how it was layed out, How you could choose a character, How you could play with someone else was nice. Weldone and make a sequal!
I agree with vynx, Try and replace the walls with something thats more likely to kill you. Also a small map in the bottom corner that showe'd you where you had been would be nice.
Another good zombie game, I'm curious as to what has inspired all these, Possibly the release of 29 days later, But still nice game, Although i do think that your talents lie in side view games and not overhead ones.
It's good, But the link when you complete it is really, really, Annoying, Lowering it's score by alot. atleast make the link appear in a new window or a new tab.