This game is great! I love the art, especially the UI! The puzzles are fun and well balanced for the short game it is . The atmosphere at the end was really cool! I think I finished the game, I'm assuming the black part was the end? (trying not to spoil it for others :P)
The only improvement I can think of right now is in the dialog system. I'm used to being able to click when a text is appearing word for word, and then seeing the whole sentence. But here it skipped right to the next part of the dialog, so I missed a few things at the start. It's just a small thing though, well done!