I review Until We Meet Again, the free official English version of Soremata, a freeware Japanese visual novel written in KiriKiri in 2005. Most of the game takes place on a nearly empty train -- and it has a striking (not to mention impressive) gray-scale aesthetic. Moreover, the way the characters are integrated into the background is interesting. A solid effort let down slightly by its short length.
https://thenewleafjournal.com/until-we-meet-again-visual-novel-review/