Thanks for your feedback :). You can proceed from where Bobbes eats the Hurrof -- as a small hint, remember that the wolf can leap across bodies of water ;). After that it's a bit of a puzzle to get Alvin to the other side.
Since I've gotten two comments so far from people who couldn't figure out how to proceed, I suppose I'll put more effort next time into allowances and dialogue to nudge the players in the right direction, I didn't mean for this to be part of the challenge of the game ;p.
Again, thanks for the feedback!
Edit: oh, and the game has a distinct ending, so you'll know when you beat it :).