I really like this, I think the sound design and the look is wonderful. Consider putting in somelight UI stuff to make it clear if the player is walking into a wall/obstacle? Like some sort of white fade on the sides of the screen that shows up when you collide with something. Also perhaps an option to toggle sight on/off instead of keeping in pressed down? Though I do like how it's harder to do things when you have your eyes open, making another reason to keep them closed.