I love the green army men designs. I'm reminded of the old toy soldiers. I ended up getting a score of 200. Seeing the entire ant colony's wrath at once sure was a sight to behold.
Everybody else already mentioned feedback about the cannons and timers. So I'll add that an .exe would be valuable in the future. It took 3 refreshes before I was able to play the game in my browser and I wanted to see if a download worked better.