As you can see, it's a tank. It doesn't do much yet: simply sitting there until it is killed, but it should be a pretty tough enemy once fully programmed.
The tank will shoot it's cannon, which fires a large laser blast. The laser blast will bounce forward on the ground until it goes offscreen. Once Blocky Man gets close to the tank, it will move backwards to avoid Blocky Man. Blocky Man can kill the tank by jumping on the driver whos head is sticking out of the top.
The tank will be difficult because it will force the player to run after it in order to kill it, which could cause the player to get shot by the tank's cannon.
It sounds great in theory, but we'll see how it works in the actual game.