Gameplay Update!

A major gameplay update:

• Music added to all areas
• 90% or so of SFX added. Some balancing still needs to be done here
• Color code map based on difficulty
• Fixed shopkeeper selling coins for free

Known Bugs:

• Frogs can jump into inaccessible locations. Just pretend they're channeling Zelda 1 Tektikes for now
• Spiders can attack during zone transitions