Invincibillity! Fuck yer!
There's an incredibly easy way to become invincible on this. Top defence, strength and reproduction rates. That way the opponent does less damage, making it a million times easier for the high reproduction rate to kick in and then if you feel threatened, swipe out other cells in seconds.
Works best with either a x2 reproduction or x2 defence, though I can see a x2 Strength being VERY leathal.
Awesome game. Kept me bust for ages. Also, you can beat most of the last levels with no power bonuses what so ever. Mass on to free cells, then mass onto lowly occupied cells. Then use those to attack the remaining cells and bam. Bobs your uncle.
Going to wait for #3 where you can compete against the other scientist. =D
-Lab