I give it a 5/5 here is why. The atmosphere and sounds in the game were great. Going down the elevator, and going deeper in the dark unground area was really creepy. While going down the elevator hearing noises from the distance or hear the rattling of the elevator add a lot to the horror and made me dread going further down.
Having the monster pop up was neat. It made me jump at the slightly sound and scared of the unknown darkness. It also made me worried about conserving my hand energy. I really like the final part of the game having to hurry back up while the whole thing flooded. I can really see the inspiration of White Knuckle, with the hand energy thing and the chase part at the end.
Game was great hope to see you make more games.