Vaelen Village - very pretty. Like the harp(?) (plucked string) that it starts with this very clearer sounding instrument before the more digital instruments kick in.
Adventure Begins - Ramps up energy. Has an Ocarina of Time in the woods kind of feel to it.
Vaelen Castle - I really dig the staccato strings in there -- it gives a sense courtly people moving through the castle.
Vaelen Woods - I enjoyed the diversity of instruments you used to form this joyous piece.
Dark Tidings - I almost like this as an ending - though it would be a pyric victory - it has a very bold, regal feel to it.
Vaelen Crown - Great, solid end game song.
These do exactly as you say - go very well with an RPG. Could certainly envision a game like that.