I am running the experimental version. I'm new to GrapheneOS, so this might be a PEBKAC error. I installed Google Play Games and Jetpack Joyride. I also have Google Play Store, Google Play services, and Google Services Framework all installed. I am logged into Google Play Games.
When I start Jetpack Joyride, I get the popup at the top which says I am logged into Google Play Games and I see my profile pop up, but about halfway through loading the game, the screen goes black. The only way I can make my phone usable again is to hit the power button twice and scan my fingerprint again, at which point Jetpack Joyride is no longer running (I assume it just crashes).