This was very well done, and very well paced, I think. I particularly appreciated the way that the box hallway offers a palette cleanser before the mazes are introduced.
Difficulty curve and introduction of new mechanics was well paced (though, I think there was potentially room for more variation in puzzles using existing mechanics after the mazes are introduced). The narration was well performed, and compelling within the setting.
I did encounter a tiny bit of jankiness with input echo events and the game responding to key up as well as key down events, but these were minor concerns that didn't really detract from the experience.
Good work on finishing early - that's a sign of good project management!