Fawesome Possum
Great graphics, smooth control, nuanced strategies, challenging difficulty (without ever seeming completely impossible), and fun, fun, fun.
Just the stuff for any awesome game, and this IS an awesome game.
Some problems I have are when weapons and items overlap one another, often right on top of the spot I'm trying to click on, while I'm trying to do something else. This leads into another problem I found with the game, which is that once you've picked up a weapon or item you can't put it down again until you've either used up all of the ammo (former) or placed it somewhere that isn't already occupied by dozens of traps (former). These don't break the game, but they were frustrating at times (most especially in the later levels of Survival).
I'm proud to say that after an hour or so of sinking my time into this cool game, I managed to unlock all the weapons, upgrades, and levels. As well, I got all the achievements except "Thank You!" and "Immortal" (I would have the former of the two, but can't seem to find the link...).
In my defense, though... I was on 36 when one of those nasty little moles got my last 'shroom. I would have had him if I'd been able to grab that chaingun, but I'd grabbed a mine. :P