This is a defend-your-base game and it's actually different from the others with one or two fun modifycations (Great graphics don't count!).
First of all, you can select a hero as an extra defender. Possibilities are three: A space marine, wich shoots faster than others, a wizard, whose ammunition is filled with damage and finally theres a witch, and her shots slows enemies down and does extra damage to the bosses.
Then theres another twist: You have to control your electricity levels. You can build factories to build up your space and (when the time comes) upgrade them.
If thats not enough, enemies drop sometimes little presents. Get your hero to shoot them open, because those are very helpfull later on the game. Those packages contain somekinds of powerups so keep your eyes field.
