Read the instructions, this app is so simple the instructions should solve all your problems..

Instructions here in case you missed them:

Tilt your device in different directions to accelerate the blue circle.

Your objective is to collide the two circles.

Each time you collide the two circles, both circles become smaller.

When they reach size 0, you pass to the next level.

There are 3 levels, and the game becomes slightly harder in each level.

Tap the screen to pause and unpause while the game is in progress

Potential Issues:

Circle movement does not accurately reflect the angle of device. Solution: don't turn your device in extreme angles.