The key to beating the later levels is to first take control of the ones that cost 8, near you. then immediately go for your enemies biggest cell. Always highlight all of your own guys to attack. Then get the next biggest that tehy own, and so on. You can also wait till their big one sends out some cells, so it is easier to take over.
for lvl 9 just get rid of as many green blocks as you can, while holding right. after they are all gone, hold left and make your guy roll back up the ramp. the go right again and rest between the circle and the wall!
Alright I got this glitch at about 26k pts on normal survival. the was I remedied it was to hit right click and hit "play" then hit "forward" and it unfroze itself. & card 4 me =D
This is nothing compared to the real game. It would be awesome to implement that into Kongregate, but it probably isn't possible. 5/5 yay for being in the top 20,000 ppl worldwide =D