I'll say beforehand that in this game is the player the one who shrinks, I hope I'm not going against the forum policies but I think it can be really relevant for a lot of users here.
Said so on the new sw thread on 4chan I discovered this really good looking game in which the player is gradually and slowly shrunken down by a female friend of him, that proceeds to have a lot of interactions with the viewer; it's theoretically a virtual reality game, but I played it without problem with mouse and keyboard.
https://www.patreon.com/resizeme here you can download it freely.