"When you can't see, the world doesn't exist...", I loved it so much. I think one of the best mechanics I saw for a platformer game. a mix of challenging and engrossing. it's sad actually that you only have 20 ratings... the only thing is the last level took me a little too long to complete, maybe because I'm not so good at platform games :D but maybe you can add difficulty levels (easy mode could have a longer fade duration before darkness or longer levels have 1 or 2 checkpoints). I mean if you wanted to add more levels later (I hope you do).