11-19 update

There are now five maps to choose from. Maps 1-3 still play the same as before. The enemy will move but not attack. On Maps 4-5, the enemy will attack, but the enemy AI is... uh... weird. Hey, at least it works. I'll eventually add the enemy attacks to Maps 1-3 once I've solved the issues.

Oh, there's a Map Select screen now that I think is pretty nifty if I do say so myself.

Other changes include music and UI stuff.