I've been using GrapheneOS for a week or so now, I set up a secondary user profile to contain Aurora Store and it doesn't have any Google Play services of any kind, I downloaded the following game from Aurora Store:
Everything works as I expected except that the Screen record feature doesn't record audio from the game and is effectively silent.
This does not happen with the default (admin) user however, and the screen recordings do get the audio.
For testing purposes I set up a third user profile and downloaded Aurora Store + the above mentioned game again, and the Screen record still didn't pick up any audio.
It seems to also be specific to this app since other audio was picked up just fine.
Side note: In order to install the game, I had to go into Aurora Store spoof manager and set device to Google Pixel 3A and set language to Japanese, but the download will still fail sometimes, I would change spoof device a few times then logout/login and retry until it worked. Sometimes (rarely) it downloads even with English as language.