Really good game! You created a perfect creepy atmosphere here, I do think you exaggerated a bit in the darkness though... It's more when we arrive in the beginning, since I can't barely see where you're going...

Increasing the beginning would be great, since the underground is very perfect as is, I mean... It's a closed space and all, so it's supposed to be dark. xD

Keep up the good work! I'm really excited to see what you plan to do next. ;p