The goal is to get the black ball to the green circle. You can achieve that by moving the black board.  You move it with the left joystick. With ,,a" you can change the angle of the board. So if you have been moving vertically, you move then horizontally. 

With ,,y" you can restart an level

If you get the black ball to the green circle you´re moving to the next level.

IMPORTANT:

THE FIRST ,,LEVEL" DOESNT HAVE ANY OBJECTIVE. It´s only for figuring out the controlls of the black board. If you´re confident with them, YOU CAN START THE REAL LEVELS WITH PRESSING ,,START" ON THE CONTROLLER. YOU FINISHED EVERY LEVEL IF YOU RECEIVE JUST AN BLACK SCREEN.

The challenges are getting harder with obstacles in the level. The Levels are designed that you normally should figure out on your own what every obstacle does.

Read the text :D