I finished the game, and now I can't stop thinking about it. I wonder if it'd be at all different if I played it again? For example, what would have happened if I'd slain the grizzled boor? He leads you to the rock concert at the end of session 3, so I'd imagine that would happen differently.
In the final session, I talked to Logfella and it said: "The woodsman known as Logfella was feeling some serious woe about the missing girl. We told Logfella that we knew where she might be & soon we would set things right. He looked at the nearby pedestal & he thanked us in advance for the whole martyrdom thing." Meanwhile she has a megatome update, "Where am I? What happened? The last thing I remember I was dream-walking in the woods when I saw an eerie pink light" which I would assume is the light of the bright moon trigon or the associated sprites. I returned to the underwater island, but there was nothing there besides the nice music. Oh well. She shows up in the ending anyway so maybe I'm just going the wrong way with this.
While I was re-exploring near the end, I talked to Jim Guthrie in the dream world and he asked me to sit down and listen to a song. I was able to play along by tapping the trees. That was pretty cool. He said he'd put on a concert in a fortnight, though I wonder if he was talking about the one I'd already attended.
Oh btw, I found a bug. If you go to the dream world, then quit to home, then resume the game some time later and it drops you to the title screen instead of the screen you were on before (I'm not sure why this happens. Maybe the app gets swapped out of memory?) then go to to the cabin, you'll see the waking up sequence and wake up. Kind of annoying if you were trying to set up a time paradox because you have to go back and do it again.
Oh, and if you need help with the final sequence, which can be rather frustrating, here's how I did it. First I ran to the gold trigon pedestal and slashed it. Then I ran to the right and slashed the dark moon pedestal. Then I sang a song of sworcery and froze the demon. He appears to slow down as he approaches you, and even more so if you begin singing, so don't panic. As soon as you've tapped his head, you can swiftly end your song by double-tapping yourself -- don't worry, he'll still get frozen in a moment. I ran past him to the bright moon trigon, sang once again and froze him to give myself plenty of time for that final hesitation. After I slashed the trigon, I darted down the stairs to get some distance, and then I had to sing once again so I could run through the dealthless spectre and raise my sword on the top of the cliff. Good luck!