Add the ability to throw rocks or something? You start with none and each island would have a rock to pick. Would also add another choice: can you get the rock on this island or do you have to reach the exit?
Probably not good either as you'll always target yetis, so still forced. Maybe with limited range?
Also not sure if you should give the ability to "wait", but it is frustrating when your only available first move gets you at melee range with 2 goblins. Guess you could throw your rock, hence staying on your bridge with only one neighbour tile, which feels like scumming :-/
TBH I don't like this rock idea much. I'll try harder!
Also pretty sure that last island I was on was downright impossible (9 ennemies, mostly goblins and skeletons with a yeti in the far back), what's your take on this for later versions?