Day 4: creature features

Today I added a bunch of stuff! More enemies, the ability to go to other dungeon levels and return to the town, the ability to train stats and buy runes with XP and gold gained from defeating monsters, the ability for monsters to cast spells, a handful more runes to play with, and elemental resistances and vulnerabilities.

As always, you can play the game at http://edkolis.com/spelllslinger/play