Your space station is under attack! Build some turrets to blow those jerks out of the sky

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Edit:
WARNING: There's a small bug with the Chain Turrets that may crash your flash player. I haven't been able to iron it out yet but be careful when using Chain Turrets as they may crash your game!
The objective of this game is to build turrets to stop waves of enemies from assaulting your space station's power core. Using energy to build and enhance your defenses is key to survival, but don't use it all up as energy is what protects your power core if any enemies get through! You will lose when you have no energy left.
This game can potentially last forever as there are infinite waves, however you will eventually be defeated as each wave increases in difficulty!
The source code for this game will be posted on HelixFox.com sometime in the near future for anyone curious about how this thing works. There are also other games and applications on there for you to play ;)
Good luck!
(This game has been previousy submitted to Newgrounds but that was an inferior version. This is the latest and fully functional version.)