Created a texture for the extra life item. It looks kind of weird. I tried to make it look like a stick figure with a plus sign, indicating an "extra life", but it turned out kind of odd.
Added lives, including an extra life item that sometimes appears in the dungeon shops. I even plan on going so far as to delete your save file if you run out of lives.
Decided to add more rooms in the procedurally generated dungeons to add more variety. Sand rooms can now appear but they are functionally no different than floor tiles.