Antbuster
This game is taking up so much of my time at work. I've gotten to level 61, but that's as far as I get.
The object it to set up cannons on the grass, between your cake, and the ant hill. You want your cannons to obliterate the ants before they have a chance to make off with your cake. You have numerous cannon types available, upon costly upgrades, that is. Good luck.