+1 for all of Michael's notes.
I liked the premise and the overall atmosphere quite a bit. The dialog as you pass the characters is a nice touch and gives it a bit of an RPG flavor.
The biggest issue by far for me was the lack of contrast on some of the tiles. Maybe you have very different gamma settings on your machine, but most of the cave/mountain/forest floor were literally invisible on my monitor. Like Michael alluded to, that would be cool if you had planned to have some sort of lantern power up and just didn't get to it, but not so great otherwise.
I was definitely intrigued and would like to play more if you get around to making it!