Main and additional themes are really great used! Cool idea, sounds. I really liked the mechanics of Reversi where with drag'n'drop - really feels great like you're playing it in real life. Background sound fits game and isn't annoys :) I really fascinated about how you did manage to make narrative game with cool plot which is still the game and not the visual novel or interactive novel. Great work!
On the other hand, speed of the dialogue is so high that I've missed 40% of them. It's a pity because dialogues are cool and deep. Also the main game concept is good and bad at the same time: it's hard to play reversi and read dialogues. You either do one or another. But I've no idea how to improve that anyway :)
Thanks for such cool game!