A game for iPad , iPhone , iPod touch and android device

HeliInvasion 2! Survive waves of invading hostile helicopters! Shoot them with your cannon, rocket, rock, wind, and try to make them rotate until they explode. Let them knock into each other to create massive chain reactions of explosions! Earn money with each exploding helicopter to repair and upgrade your cannon.

Features:
- Support Multi Touch after getting double shell , players can control the direction of the shell.
- GameCenter enabled, compete with your friends through online Leaderboard via the GameCenter system!
- Upgrade weapons's rate of fire and amount.
- Using box2d physical engine to simulate the collision, flying, exploding.
- Support iPad, iPhone and iPod touch.

   HeliInvasion 2

Great improvement from the first version.
1. Upgrade whole UI graphics.
2. Four properties provided, STONE, WIND, SHIELD and Recovery.
3. New bullet for cannon.
4. The MainMenu is also a game.
5. Support IAP.
6. Provide "Recovery" item in game.
7. Support challenge mode, hard with more fun.