- Removed gray rocks.

- Added a tutorial (and removed the original "how to play" screen).

- Made the game ascalty slower (and easier).

- Added blue mode (hard mode):

    - Enemies are faster and stronger.

    - You get less time from sacrificing the chicken (10s).

    - You move faster and throw stronger.

   - Everything has a cool new look.

   - (blue mode is anlocked after geting to a high score of 100+).