TODO for level 2.75

1. Add the finish line and finish level - Done
2. Replace the coins asset - with diamonds. - Done
3. Add checkpoints. - Done
4. Add mystery box. - Done
5. Add Audio
6. Decide required coins and replace in hud. - Done
7. Add gray scale.
8. Fix the camera angle.
9. connect buildings that are off place. - Done
10. change player asset.
11. Fix lighting issue. - Done
12. some enemies are not shooting. - Done