Not bad
Tips:
-Place your turrets in the corners. You can have 5 so double up the turrets in one of the right corners--there's less dirt on that side.
-Enter the store by pausing the game (hit "P")
Short and sweet. Simple, effective controls. Looks and sounds ok. I like the song. It's more intense than the game is. The game is too easy. Also lacks variety; only one enemy type, repair and turret are the only things you'll buy, no real change from level to level, just more dirt in the middle.