Demo playtime is about 1~2h
https://store.steampowered.com/app/2018440/Tentacles_Party_With_Nuns/
Demo playtime is about 20~30 mins
https://store.steampowered.com/app/1985620/Ghost_Girl_Lasling_Grated/
Steam Next Fest !
Source: Steam Community (opens in a new tab)