"Space Defense" is a game avoiding and destroy enemy spaceships and missiles attacking artificial planet. Destroy enemies with artificial planet orbiting turrets.

You must survive from enemies attack by upgrading your turrets, a ray cannon which has the advantage of a straight attack, a missile that follows the enemy and destroys it, a bomb that has splash damage, a wave that pierces the enemies, and a laser or satellite that orbiting an artificial planet. By upgrading the artificial planet's energy, you can more endure from enemies attack longer.

Drag the screen to move the artificial planet and then turrets automatically attack enemies. If you destroy more than a certain number of enemies, you can upgrade your turrets as a reward for victory.

The boss are unknown alien energy sphere. Defend the space and make peace by protecting the artificial planet from the boss firing many bullets and having enormous energy.

Have fun with "Space Defense" shooting game having simple controls instead of complicated or difficult games.

[How to play]
1. Drag the screen to move the artificial planet.
2. When you crash with enemy, the energy of the artificial planet is reduced.
3. Destroy enemy spaceships and missiles using turrets.
4. If you win, you can upgrade your turret.