UnderRail is a work of art for me. Close contender with Half Life, Hotline Miami and Ash of Gods. But if we are talking about one that really strikes your emotion, the GOAT would be This War of Mine.
Eastshade by Eastshade Studios easily one of those indie game tittles that deserve your time and attention, an itinerant painter travelling through an unknown and distant land trying to forget his past improve his skills and discover the most beautiful scenarios known to man or beast.
Really incredible product, a very relaxing and unique experience!