Lots of stuff added.

• Added some background music. My plan for this is to compose some songs and then randomly pick one to play for each level.
• Added collision detection for treasure and octopus.
• Added a level ending tune for when you get the treasure. The game then goes back to the title screen. Eventually I'll have an ending song and tune for an ending.
• The game (and music) also stops when you die.

What I'm going to change:

• The "try" thing. Right now you get 999 attempts to finish the level. What I'm going to do is have it start at 0 and then add tries (like in Castle of Doom) with the object being to use as few tries as possible.