Ideally, it would not be a roblox game. I personally would rather not make a roblox account at all. And I want to be able to save progress. I don’t usually end up with unlimited time to play games with him and such. But the game is mostly simple. It co-op, and he likes it.
After looking at the game’s page, I’d say you could try Raft. It’s a generally chill survival/crafting game with multiplayer co-op. There is wildlife that can present a threat, but it’s definitely not as horror-y as 99 days looks.
we have put many many hours into raft. Also satisfactory, minecraft, tf2 (though my wife doesn’t like that one :)). I am open to more options as well.