Idle Tower Defense-merge plane

Unknown virus is invading the earth!Beautiful blue planet is in desperate and need your salvation.
Game features:
- Easy to start
Just tap and swipe easily to send your troops to fight automatically.You can get a lot of rewards even offline.
- Interesting strategy experience
Different shooting strategies correspond to different shooting effects,Move your brain,fifty Interesting levels are waiting for you!
- Rich game content
Placement, tower defense, level challenge, synthesis, multiple armor...Rich game content is waiting for your discovery!
- Extreme challenge
Upgrade your planes and challenge yourself! Win your glory badge!.