This game made me shout like a crazy man. Especially the last level being very hard - you have to guess your path - . The story is small, and resembles just a philosophic thought. You need more to be able to take on this theme.. like a story with characters. The song fits the story but the game is a piece from another puzzle trying to forcely mix with them. The only element of the game itself that fits the theme is the darkness.
Shortly: Too much emotion (story+song) for a little game.
Some reference: Take example from 08jackt, who is amazing at dramatizing the most profitables areas of his games. (Alula Falling 5 ending, and Chronicle Bulletin). Sorry if I'm driving your fans away. ;) Your work is still very good for your level.
*Sorry for typos, if they are.