Sideral Defense is a tower defense like game with a twist. You plant your defense lines on the different orbits with the objective of avoiding space pirates to reach and destroy your planet. You've got several towers, several enemy types and bosses that will try to destroy your planet.
Sideral Defense Gameplay part 2.
In these two gameplay videos you can see the different kind of enemies in action. Like the invisible ones which make the missiles to go with no target. And the use of Radars to detect the invisible enemies.