Please Follow from developer somewhat who also made Please (which I certainly enjoyed) recently released another short psychological horror. Much like their previous, it's a mix of a walking sim with some horror elements that rely on the environment and your own imagination to disturb you along with light puzzle elements.
In the official timeline, a lone surviving soldier ventures into the tunnels dug by the opposing forces. Deep inside the bowels of the battlefield, they come into contact with a presence that will open their mind to worlds and events better left unseen.
Since I'm somewhat of a coward, I enjoy these short bursts into the weird and unnerving. It allows you to go through all the emotions and not be completely destroyed by one going on for tens of hours and I think it's great there's more like it being made.
The Linux version of Please Follow was made "based on manifest interest on past titles" but it's not been thoroughly tested.