Really Easy game. Great concept, could use a few tweaks like making different types of enemies. Tesla Coil was got really over powered if you just spammed natural gas and windmills.
The tutorial was made when CS3 was the newest thing. Now that CS4 is out, the program in the link was replaced on the Adobe Website. Not the flash creator's Fault. Get CS3, Not CS4.
Quite easy, got all the badges. very fun game if you can predict and have the projectiles skim past your line with timing. Once you get one line in the bonuses, it gets easier.