First of all: Very nice game, i am coding one myself too, also with 2D graphics and stuff! =)
I've only one problem in your game,
after i left town and went on, i came through a little cave and ended up in a forest with thornes, i can go "through" some of the trees but then suddenly one tree has collision and i cannot go further, i can see a troll beneath me but cannot reach cause of that thorntree
but so long: good job ! =)
regards
jany