Just a thought...
I quite like the feel of this piece, the beginning has a sort of tranquility to it, I think it's more effective when it's left a bit sparse.
As for where it's going to go, how about a ternary (ABA) form?
Your original theme, then a more bright and lively section, then return to your original theme, and either end or loop it, when there's not too much going on I can imagine it being like a "wandering round" music in an adventure game where there aren't things trying to kill you.
I'll stop rambling. Good job though :D