Sphere Invasion is Sci-Fi Tower Defence.
Destroy hords of this bad spheres on many different ways.
Build road for them and use 7 unique towers to kill them all.
You can slowe them using Slower then smash your enemies with powerfull missile tower attack.
Or electrocute them with tesla tower thats your own decision.
7 unique towers, 12 enemies, many hours of great gameplay.
