T.M.R. reminds me a lot of Penumbra and Amnesia, in the way the puzzles work. This a very impressive demo made by 2 developers. The history is interesting and leaves you with a sense of dread. 

I admit I rather enjoy the game without enemies, when it focuses on environmental history telling rather than another hide and seek esque gameplay. 

Overall, very recommended and you can can see how it runs on Steam Deck by pressing the link below: