I really enjoyed the game! The art style greatly enhances the mysterious atmosphere while solving the puzzles. There are a lot of fun puzzles to go through, and the use of different abilities to solve them makes the game feel very polished and complete. Very impressive!
As others have mentioned, there's a bug where multiple abilities can be selected. I tested it and found that the issue seems to occur when opening or closing the ability menu while spamming the up/down keys to select abilities. Another bug I encountered was that if the player jumps while standing at certain bookmarks, it skips the dialogue.