You are a mad roboticist of the steampunk age. Your latest plan of world domination was perhaps a bit overambitious, and now your robotic creations have gone haywire and are assaulting your tower. You must build traps to destroy them before they reach you - or suffer the consequences.
Mechanical Tower is a tower defense game. But instead of defending with towers, you defend in a tower, with traps. Among the six different traps is a trapdoor, which allows dropping the assaulting clanks to the previous floor to have another go with the traps there.