nice
i really liked the concept, simple game but fun as hell.
only gripe i have is that its clumsy to change between the snot and everything else,
if only the snot wasnt drag and shoot, and just click, everything would be a lot simplier, (maybe that was your whole point, but it makes me wrist tired)
wrist + tired = unhappy gamer :(
but other than that it was thoughly enjoyable, always having new elements in the game was very good, but i think the individual waves were just a tad' too long.
upgrades and difficulty curve was fine, hope to see more of your games :D