Overall, really good execution. I thought your level design and introduction of new mechanics was evenly paced and well thought through.
The only criticism I have is the player movement as it can feel a bit unresponsive at times. I think in a game where the puzzles are solved by navigating the level, movement is a very crucial aspect of the game. The player is then also punished for incorrect movements when falling into pits. I agree with your previous comments that the grid/tile based movement system isn’t very apparent from the floor design and maybe making this a bit more implicit would improve things.
With that being said, I though everything else worked perfectly and I thought the combination of art and sound design gave the game a great atmosphere and I hope you continue with this project in the future. Well done!