Flappy Chopper - A Frozen Ice Cave Adventure

Flappy Chopper is a side-scrolling mobile game featuring 2D retro style graphics.
The objective is to direct a Helicopter, named "Flappy", which moves continuously to the right, between the ice caves.
If the player touches the cave floor or roof, it ends the game.
The helicopter briefly flies upward each time the player taps the screen; if the screen is not tapped, the chopper falls due to gravity.
The player is scored based on the distance travelled without dying.