Adding a win condition

More art and game development.  I've added some doors to the cave, so it's possible to get in and out (not that there's anywhere to go at the moment).  More importantly, there is now a win condition!  Just walk out the cave entrance to win the game!  Not a terribly difficult thing to do at the moment, but it is a jump forward for my game logic.

Also, the lizard guy now takes a breather after taking damage.   Makes the fight a bit more realistic.