This is a quality scifi tower defense game source code can build for iOS and Android.

Simple but challenging gameplay, awesome graphic, many enemies, many towers to build, many levels to play, mobile control ready, very addictive and interesting, you can build, power up tower and defense your planet from lot of enemies.You can easily change sprites to reskin it or use it as a template for your own game.

The game has 120 levels ready.

Recommended Unity 2018.4.29f1 or higher

APK for testing:https://www.mediafire.com/file/1d2nelcbqs3jb2x/earthdefense12.apk/file