I think it's a pretty good start! When the street lights were on I thought "this looks absolutely great!", and I think that increasing the flashlight radius would increase enjoyment of the game.
It's a labyrinth type game with a bit of parkour involved and simply-implemented (but hard to solve) puzzles. Atmosphere is eerie and top-notch, minimalistic style adds to it pretty well. I think it's a beautiful project, but could definitely use some polish.
(Spoilers ahead)
I was indeed stuck at getting the red key. This is a bit of moon logic and well, honestly leads to some frustrations in some gamers (like me) though maybe others will think as using lampposts as parkour option will think it as "AHA!" moment. It was frustrating encountering a yellow key puzzle at this point. You look at the light and at the contraption forcing you back and think "alright, just backtrack and turn off the power and we're golden!" but this actually closes the door to the area.
And yeah, I attribute this to the flashlight failure, cause when I can't see crap, it's really hard to look for parkouring solution. The singular light source also makes it a bit hard to distinguish objects' depth, so yeah I just don't think darkness and parkour mix really well (like in real life).