I really like the overall mood and concept, and even the low quality of the visuals gives it a nice liminal feel. The use of complete darkness as a game mechanic is really interesting, and it definitely toes the line between interesting and frustrating. Also, I didn't see any explanation of the controls, so it took a couple minutes to figure out what to do (not sure if that was intentional). I think to make this a fuller game, there should be better gamification of the darkness—what do players get from walking around in the darkness? It might also help to introduce a narrative from the start or at least soon after the game begins. Solid prototype!