New idea offers opportunities for interesting mechanics and surprising tactical depth for a tower defense game, also somewhat steep learning curve. I've found myself replaying first few levels numerous times just in order to get higher accuracy rating and score more improvement points - and it doesn't get boring as you try different combinations of satellite types to improve your survivability against different types of enemies. Also, great visual style and music! Overall: accomplished addictive game that makes you think as well, as it makes you aim.