This game is much better iteration of the expanding blob idea than filler. Just to see what happened, I played to level 250. After level 172, it is possible to win by just waiting, so its a bit boring from there on in, unless you want to see what happens when the screen completely fills with outbreak. Incidentally, nothing interesting happens. As you reach levels above 50, the game changes, and then again as you get over 100, requiring different strategies. After about 164, the strategy thats completely safe is to click, and then wait for the outbreak to self destruct, then mop up. After 172, you can just click and wait for it to die, maybe killing a couple of die-hards at the end.