Sci-Fi Space Defense : Alien war game

Play the hit action strategy game with over than 30 challenging levels.
Meet, greet and defeat legions of space ships from the dawn of time to the end of days.
It's the "tower defence" type of game but with new, futuristic, amazing retina graphics.
Build and upgrade towers by destroying enemy ships and try to defend your base
You can use several power-ups on your defence, that help go stay alive longer. To add more strength to your tower just visit the in-game store that allows you to buy superpowers & upgrade towers.
You can get coins from playing and getting high-scores.
Just Defend your base and stay alive for as long as you can! Good luck!
Features:
* Realistic physics engine
* Smooth animation (Constant 60 FPS)
* Beautiful retina graphics
* Awesome epic soundtrack
* Amazing sound effects
* Super sensitive controls
* 30 Challenging Levels
* 2 Game modes : Campaign , Survival
* 2x mode to speed up gameplay
* In-game coin store
* In-game superpower store
* Game Center Leaderboards
* Game Center Achievements
* iPhone 6 , 6 plus and iPad retina compatible