Graphics: In a 3D platformer, the most important thing, though it's a tiny detail, is a drop shadow. Placing a shadow directly under the player can provide a much needed sense of depth when looking at the ground. On top of that, any amount of shading would go a long way. All the walls are the same shade of brown, which makes it a bit unclear where corners are.
Audio: The music is a bit... repetitive. I like how it builds! Extra instruments are added which is very nice, though the melody rarely deviates. That being said, I like how long of a loop the track is.
Mood: The creepy enemies set the tone 100%. Any other design and this game would feel different. I like the creepiness of it all.
Innovation: In a weird way it makes me think of Celeste 64. Dashing is a super cool mechanic that more platformers should explore.
Fun: I had a blast. Just flinging myself into the void trying to find cheesy shortcuts.
Overall: I mention it in the video, but some of the mechanics are just not explained to the player in a good learning-environment. You had a poster on the wall in room 1 (which was honestly pretty vague) and I think the game could use more of those. I recognize now (after finishing the game) that you explain some tips on the web page, but that should really be explained in game.
And here's a video of me playing! Great game. Cheers!