Ok, the little message it gives you when you lose is very stupid. This is a lot harder than you seem to give it credit for. My rating was at 3/5, but after I get "Maybe you can ask your mom to help!" after I lost.
1/5
juggling is when you sell a tower to get a creep to choose it's path, then place one to make the creep change it's path. If you do this just right, it makes the creep totally stop, because it keeps changing it's mind. It's a very cheap way to win at this game.