I've just started testing this one out and have found a few things that slightly annoy me. There are quite a few small shrubs that are impassible, I don't know if it's just me but it's difficult to tell a passable shrub/plant from an impassable until I run into it.
As previously stated somewhere above, I think there are some balancing issues, even before you get your first party member to join, the hornets as a pair can be quite deadly, not to mention the three spider party.
Now I didn't go straight to the other party member, I explored first (which you need to in order to determine where that party member is in the first place) and I think wandering that forest gave me a drinking problem.. Drinking too many potions and antidotes that is

And my character is much too young to turn into a lush so early in the game.
I think you stated that you want the player to go straight to the other party member, but you have to keep in mind that players are gonna play their own way as well. It seems that the player will have to grind quite a bit of levels before moving towards the castle as well, those slimes are quite powerful, as are the group of three rats.. I kinda had to take a break for the time being as I'm not ready to head back to the forest to grind some levels on hornest and spiders.
As far as dialogue the greeter in the first town you come to, has the same conversation with you every time you talk to him. You know the one where your companion is about to reveal what tribe she is in, but the main character prevents her from doing so, again maybe it's just me but I find it annoying.
But other than that great use of the RTP from what I've seen so far. Not sure about the story or characters just yet.