Interesting concept, but the execution leaves much to be desired. First off it's too slow, and second off it would be nice if more of the play field fit in the display. Either by making the individual elements smaller or by making the display larger.
A good start, however the lack of RPG elements makes me a sad panda. With the addition of a skill tree, a way of seeing how well you did on a given map, and an actual use for the gear this could be great.
Major problem: I ran out of wood and can't buy more I would be nice to be able to get some wood so long as you have some money.
Also: How the hell can there be a cave in when the only thing above me is air?