836 seconds! Very fun experience, kept me engaged, very impressive for a maze game! I've never seen the approach of occluding the maze; it's probably my favorite method of going through a maze because it makes you remember what you've seen without being as intimidating as a first-person maze.
I only had one major issue with the game: controls. When I press the right arrow key, I keep moving right; however, once I press the up arrow to move up a tile, I stop moving right. I got used to this method of movement, but it felt clunky--and for a maze game, it's all about smooth controls. I'd expect to be able to resume moving right after I release the up arrow.
In way of suggestions, a few ideas popped into my mind during play. Flares and Beacons: you have a limited amount of both, you can shoot flares to any spot in the map to illuminate it; you can place beacons to preserve light in the place you are at. I also thought it would be cool if all the different colored mazes all had different "characters". (e.g. red could have long corridors while green could be very dense).
Overall, a very fun experience! I loved the more experimental music and chilling atmosphere presented. Good luck with future developments!