Cube Dream

So you are a little cube applying for a job deep inside a space based chain assembly. Your task is to supply the factory with different cubes faster than the other applicants.

The game ends when no more cubes of any of the colors remain in the ground.

Controls:
Move with: WASD or Arrow Keys
Pick / Leave a cube: Mouse Left Click
Pause / Leave Game: Escape

To deliver a cube just pass near it's same color belt zone