I like the concept. The problem I have with it are mostly minor ones that works together to damper the experience..
The most obvious one is that when you fail, the game tells you to backspace to restart. The problem is that you have to wait a amount of time before the backspace button can work. There is no telling how long I have to wait to restart and the waiting period seems almost random each playthrough. It makes repeat playthrough a drag simply because you have to wait, and you don't know how long to wait.
Now with the biggest cratiqe out of the way, now for a smaller one that I'm not sure is by design or not. Either way, it could be better. Okay, so there's not enough time or room at the start to get a good sense of how the character moves. It feels like the lights cut out before I can get a feel of what arrow keys would do. Because of that, it's not just a matter of memorization, but also estimating how far the character goes in a single button press. It took me awhile to realize that I don't need to hold the arrow keys to move. If memorization is the focus, maybe a tutorial room you can access with the press of a button can be added to allow the player character to move around in a spacious room with the lights on until you return to the main room. That way, the player can get a feel on the controls, and then focus on memorizing the map.
Overall, a interesting idea, and one I think is worth a few more updates in the future to become a nice small experience. I would like to revisit this later and finally beat it when I have time. Keep up the good work.