I really enjoyed the story elements between the diving sections, I felt sad when I saw the final piece. Was the father scarred forever by his diving experience, or is the diving experience a metaphor for addiction? I wish I could go a little faster sometimes but found the controls overall well-made. I like the change in movement for the final sequence and the accompanying sounds, it gave weight to the final section. If there was more time I think more could be added to the world design and more mushrooms or lichen would have been really cool. Maybe rocks and kelp if this does get worked on more afterwards.
I also really like the sound design and the choice of using the VHS filter. I think a music track with a slow build-up could be an interesting addition, and I think more could be done with the monster in the final section. Maybe more hints of movement visually in the distance before the attack (If there was already visual signals, I may have just missed them).