0.2.0 Update

This update addresses some of the feedback people gave me so far.

I polished a few things, fixed some bugs, and most importantly, changed the menu BGM, the previous track was being flagged by YouTube's Content ID, so I had to replace it.

===Changelog===

• Fixed a bug that made the game not save progress properly
• Equalized the environment sounds
• Added a light flare to the keys to make them easier to find
• Changed menu BGM due to Content ID