It is google Android but they do not pay for the name so they call it ‘FairphoneOS’.
That’s not how that works, they call it FairphoneOS because they added their own customizations. Default Android is pretty barebones nowadays so nobody uses that. You dont have to pay Google to use the Android name
With modern hardware neither of those really are an issue. You can get a 1 TB nvme ssd for €50 and 2 TB for less than a 100. That should lend you plenty of storage and speed
I haven’t played the games and even I knew the movie wasn’t accurate to the games, although there are a lot of references according to friends. The movie isn’t very good, a few plot points could easily be explained away, typical “I don’t have time to explain” type stuff. But it could still be a decent watch, although don’t expect to get scared because it’s not very scary