I've heard this scenario is much harder multiplayer.
I also tried it with a single sphere spirit deck and failed miserably - there's no card draw or healing, and 2 heroes got sacked and roasted.
Leadership next, I think.
I love this story, but I have to point out a flaw in the playing. Forest Snare is an attachment and thus can only be played during the Planning phase. Therefore, all 4 trolls would have attacked, and your threat would have gone up by 12, forcing you to threat out