not an obvious choice but one game id suggest people with a PS5 pick up is No Mans Sky.
was pretty broken when it came out a few years back on PS4 but the makers have released so man updates it is practically a new game. there is a dedicated PS5 upgrade for free which adds all the usual PS5 extras like haptic trigger and better graphics but crucially it massivly reduces loading times which really broke the Ps4 version for me.
They have also added multiplayer, permadeath modes but best of all they have Creative mode which is perfect for the No Mans Sky gameplay as you have everything the game has to offer instantly alvailable and you can just explore without stress. Great fun. Also it only takes up 12Gb on the SSD
I picked up a secondhand PS4 copy in game for a tenner and used the free PS5 update. Bargain