Use game loop

[cubei]

Instead of updating the game with a constant timer tick, a while loop should be used with the option of frame skipping.

[Mershl]

If you're at it can you please:
1).update the game to play in Horizontal View ?
2).decrease a foreground (fg) speed a bit slower ?
3).add a life coin to the game when the cow eats ?
4).animate both background and foreground images in order to look amazing when playing ?