There is no way to screen shot the issue as when I click on the thumbnail for the game I immediately get a black screen that rotates my screen to a horizontal view and then immediately (as in less than 2 seconds of time passes) returns to my iPhone home screen. There is no loading screen, there is simply nothing but a temporary darkness before it all just ends and goes back to the home screen. The home screen will be rotated horizontal however, despite having my screen locked to vertical and will stay like that a few seconds before correcting.
Same issue on my iPhone X. Not seeing the problem on my iPad Pro but no iPhone makes it hard to play when out and about. Game crashes immediately upon launch. Tabbing through open apps after crash shows a paused tab but trying to access it results in an immediate crash.
I have tried on both WiFi and cellular.