It's pretty neat even if it's short. Something to be said about bypassing philosophical musings about non-human experiences by... actually simulating the experience. The head bobbing might have gotten unpleasant if the time spent in the cave (where the walls are close enough to notice) was longer, but as it is wasn't really a problem for me. Music's nice and chill, the sound of the sonar is subtle enough not to get annoying...
A few minor bugs (heh) I've noted:
- Nothing seems to prevent me from spamming the sonar so much everything lights up.
- The warning about sunrise interrupted the ending text about managing to return to my cave in time.
- You can overfeed past the food bar's maximum.
- Pressing ESC enables the mouse cursor, but no menu shows up?
Nothing that really affected the game though. Had a good time!