I recently really like the game Null's Royale, it's not just a toy for one - two days, it's a real full-fledged game that you can play for a long time, every day to develop your city and character, and it will not bore you. In general, I really like this game, and you can play it alone or with friends on the network. You can download its APK-version here https://nulls-royale.com/download/.