I know nothing about the games, but it’s £4.99/month and the first month’s a free trial.
Plus in iOS 13 you can link an Xbox One or PS4 controller to your iPad or iPhone.
https://www.apple.com/uk/apple-arcade/
Are any old the game going to be worth it?
Shinsekai Into the Depths is my pick so far, put about six hours into it and it keeps opening up. It's an underwater exploration/survival game, reminds me of a cross between Nodes Of Yesod and Ecco The Dolphin, with a bit of Steamworld Dig. The movement and animation of your guy is just beautiful, it's one of those games that feels good to control, the inertia and floatiness is spot on and makes you want to play it just to move around. There's something really intimate and atmospheric about the