Well that was an experience. :D Very creative, very creepy, a lot of me saying "what the heeeell...". I very much dug the atmosphere and the waning light was thoroughly dread-inducing, as was the weird grumbling that would occur as you went lower. Definitely A+ for atmosphere. The Recoil Jump was a fun mechanic to get used to as well, it was much smoother than I expected it to be when I first got it.
Some general feedback:
- The checkpoint noise was pretty intolerable. I kinda didn't want to go to checkpoints and ended up turning my volume down because of it.
- The gun reloading / fire rate felt inconsistent. At times I could unload an entire magazine in rapid succession whereas other times there was a bit of a delay. It kind of made fighting the enemies unpredictable and a bit annoying as I just found myself firing while running backwards as they chased me and not knowing when my next shot would go off.
- The Recoil Jump was cool, but when I first got it didn't work for the longest time, it would just make the screen shake. I finally ducked and it made the little ability icon appear next to my ammo count, but I was pretty confused for awhile there.
- Finally an odd one, at first my character wasn't turning when they'd move to the left, they just sort of backed up, but at some time during my playthrough they started turning properly. I'm not sure what happened but figured it's a small bug worth reporting.
I kinda flew off the edge of the map and there wasn't a reset option so I haven't beaten the game yet, but I'm going to go back in later and finish what I started. Exploring the map was quite fun and as bardycreepio mentioned below the level guides you fairly well despite getting darker and darker. Very nicely done.