First things first, I generally like the idea of "reactive music" but if you want to go that way two piano notes an octave apart are clearly not enough. I think the mood of the game is enjoyable and interesting for a platformer but the execution is lackluster. I found the dialogues between the player and the "spirit" character a little bit cheesy. Maybe it's just not my cup of tea.
I also think it's a problem that you can't discern truths from lies in any way except from choosing a path and realising it afterwards, it kinda makes the game not a liar, but simply a random one!
The best things in the game, in my opinion, were the main character design, her animations and the general platform level design.