Iron Lung is a sinister, but delightful short ride through an ocean of blood.

It's brilliant in the way that the limits it puts on you makes you use your imagination to manifest the horror. The excellent sound design and low-fidelity graphics aid it quite well in that regard.

The grainy photographs show you enough to mostly understand what you're looking at, but this game puts you under so much tension, that it might make you see things that aren't actually there.

I had to give second glances at some photographs, convinced I was seeing ghostly silhouettes or faces in the grain of the photographs.

The idea of piloting a submarine without an actual reliable visual aid and instead using co-ordinates to navigate felt refreshing.
Planning co-ordinates in advance and trying to safely and efficiently make it through, almost scratched the same itch a puzzle game would.

There's also a surprising amount of worldbuilding and lore surrounding the game, which you can optionally access at a terminal inside the Iron Lung.
It's a nice touch for immersion.

All in all, Iron Lung feels like a novel take on the horror genre.
The short length of the game makes sure it doesn't overstay its welcome, and allows the pacing to create something that will make it stay in your mind a while even after you've finished with it.