The original intention of this game was to experiment with my various ideas about tower defense.

•  What if towers could be built on walls? What about built into the ceiling?
• What would happen if the tower simulated reality? There is steering speed, elevation and depression angles
• What would happen if the level was a three-dimensional space? There are two floors, upper and lower, and many pillars. Is it a maze or a rotating sphere?
• What if towers could be built on moving platforms? Or will the platform rotate?
• What would happen if the enemy could stat damage and dynamically find paths?
• What if.....