EDIT: This post has been updated as of 1/8/22 to reflect newer content. I apologize for the confusion if you read this topic before this update was applied and couldn't find all of the games mentioned in this post on the App Store.
For those who are in search for games, I have tons of them on my device. Here is a handful that I play.
Adventure to Fate Future Arena
Snakes and Ladders (Unar Labs)
Circus Master's Revenge
Tic Tac Toe (Unar Labs)
Quentin C's Playroom (web client can be access from www.qcsalon.net)
Both Hosted Games and Choice of Games apps, which contain hundreds of text based games. They still come separately, but they have recently made it into a whole actual library.