Well made crawler with a unique approach to gameplay!
Personally, I was not a fan of the hunger mechanic. I would have made it a bit more forgiving, but it definitely made everything a bit tense.
Alternately, I think the fact that it is hunger, but it causes you to die so quickly is where I felt disconnected. If it's actual hunger, then it should take much longer to die. But if you replaced it with something different like breathing oxygen tanks that would make more sense. Maybe the tomb is filled with poison gas and you have to fill up your oxygen tank regularly ... just an idea to consider if you plan of developing the game further.