I don't play mobile games anymore, but the game I did play a lot was Progressbar95, self described as a "hypercasual game". It's basically a collection of little games tied together with Windows, MacOS, and older computer theming, including stuff like a solitare and minesweeper clone. There is not much "upgrading" outside of gaining enough points to unlock the next theme, and clearing enough labels to get stickers for each theme, but its a fun little time. Also, it's on steam for $5 if you wanted the real computer experience.