Lots to dig into here. I had fun, although I agree that the game seems a little unforgiving in having a "right" way to go about it that maybe I wasn't catching.

This is a cool concept. I like the serious tone, though I did feel frustrated playing at times. I think this could be developed into a cool full-length game! 

I wasn't expecting to play a game with a mature theme and story. Although I don't normally play games such as this one, I respect the creators for wanting to focus on a mature experience supported by its story and ambience. The pixel art is strong, and I like the added visual effects such as the pixel light sources and the shadow effects when passing through corridors. Passing by corpses of your previous attempts were disturbing (in an effective way) that adds to the atmosphere. I can't say the level design and gameplay match in quality; its mainly a walking corridor simulator. While being wary of your step counter has narrative effect, it ends up leading to trial and error as you figure out which way your supposed to go. But as I said, the narrative, art direction and ambience help make up for it.

(On a minor note, I experienced a bug where I walked through a solid wall, but wasn't game-breaking.)

Props to the developers for tackling a mature theme!

I find this game to be incredibly unforgiving.

Every step I make makes the geiger counter go up. I get that. But my problem is that almost every potassium canister is set an exact number of steps away and if I make one slight deviation, I'll never make it in enough steps. I have to be PERFECT. It's hard to be perfect when I have no idea of where to go and switches used to open the doors sometimes take two presses to open properly and that ends up wasting precious steps. The upshot is that every time I make one mistake, I may as well just reload right on the spot and more than once, I die when I'm literally two steps away from another Potassium canister.

It's a shame, because the artwork is great and the overall mood being set is FANTASTIC. If you're going to work on this (and you should because it's an awesome idea), make the increasing radiation meter time/duration-based instead of step-based imo and make it a separate gameplay entity from the geiger counter (i.e. the player absorbs radiation and that will slowly trickle away at their health at a fixed rate, that overall rate of damaging radiation increases when the player goes into areas that set off their ticking geiger counter and stays at that new faster rate even when they retreat).

There was loads to see and do in this game. I really enjoyed it and the mood was set really nicely. Lots of death went down and I got everyone killed. That's ok though as I had a nice time doing it. Good job

It was easy to get lost, took me 2 tries to get the good ending, maybe better indicators on roughly where to go?

I like the sombre tone, seeing the names of the members that died, even in the good ending, was a really nice inclusion. I was a big fan of the lighting, have always wanted to try lighting in that style that moves around walls, is that done in a shader?