Fline is a casual android game. You must control the ball over the Accelerometer control. So, you will have no single button to use in this game. At least you can tap the screen to pause the game. The game consists of 8 levelpacks. Each consists of 5 consecutive levels, all of which must be completed within the allotted time and must not be touched by the lava or the enemy.
In the guidebook you can see all existing items.