It will all depend on the game, and if the developer has the will to port it to a different apple operating system. In theory, a game that runs well on the equivilant macbook Air, could potentially play decently on IPad, provided the themals can be kept under control.

Though, unfortunately the porting toolkit isnt a one and done thing. Its a toolkit, it provides tools that lubricate the transition to apple silicon. It also provides a pretty rough translation layer that allows developers to get a taste of the potential performance on the silicon, however the layer isnt perfect, and isn’t really designed for production use.

That being said, the toolkit has tools to convert shaders over to Metal automagially, and if the developer chose to use a rendering or input framework, it will make the transition very easy indeed.