This game seemed way too easy to be honest. I really liked it though and would probably give it 3.5/5. Just make it harder. (yeah, that's what she said).
I finally figured out how to play this game. I typically used the strategy to build a ton of units, maze style. Instead, you need to build the maze with the crappy tower and then upgrade only a certain number of units, trying to max them out. When you put 5 points into a tower, it pwns. I'd say it took me 5 hours to get the 15 pt badge. I can't imagine how long it would take to get the other badges. Great game though.
2/5. Seems too easy. I just flailed my mouse back and forth across the screen and got a majority of the doeos. Having a better mouse increases your ability too.