Personally, I like this piece very much. The chordal shifts/tonal shifts were nice, and the piece fits the description of the title. No issues imo with the compositional aspect of the piece. the only criticism that I have is that the piece seemed, just as the title suggests: "Heavily Mysterious". In your comment, it says that it conveys happiness, awe, conflict, adventure, but personally, none of these were conveyed to me. That's the only fault I see, and it's a minor one. If this piece were one section of a larger work - one of life, happiness, awe, conflict, adventure, etc - and was meant to be the "mystery" section, I would have definitely given it 5/5.
TL;DR: The piece is awesome imo, but there seems to be a lost connection in the message you're trying to convey.