If you can truly call it a game,
Lol
Plant.
You have a virtual plant and on day 1 you plant the seed, you get a random plant, mini palm, rose, fern, chestnut tree (I grow American chestnut saplings so that one is my favorite) etc each day you have to water it play with it (some simple game like guess the number like on the Pokemon pikachu pedometer) clean up any fallen leaves perhaps fertilizer once a week perhaps let a bee fly around it or something and of course give it sunshine, by sunshine play the game the time you have it on counts as time in the sun
Anyone can make this if they feel like it because I’ve no skills.