Updated to v2.0

Fixes, improvements and Challenge Levels added:

Fixed; skeleton-gold and random-gold appearing after an explosion   was not working before key was picked-up. This should be fixed now. 

Spawned gold could cover / hide  a dropped skeleton-key. This should be fixed now so the key should properly show after any gold spawns. 

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A little bit more 'escape time' added after a skeleton hits the player-character.

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Still occasionally had issues with the randomly generated rock-field for when entering a new map. Hopefully things are working better now for this and that there's a good balance . 

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On the start screen, the Player will   now   be prompted to enter a number, 1, 2 or 3, for the Challenge Level. 

1 = exit 3 maps. 
2 = exit 5 maps.
3 = exit 10 maps.

The skeleton-key-holder will be increased per map #, so for example; On map # 1, the 1st skeleton appearing will be the key-holder, on map #2 the 2nd skeleton will be the key holder, on map #3 the 3rd skeleton, etc... Up to as high as map #10 would be the 10th skeleton being the key-holder. The according skeleton-key-holder of a map needs to be defeated and then it will drop the key.