Difficult to say. Really difficult to say.
I remember buying the game on the psn at day 1 because I couldn’t wait the day after to go and buy it at the store. The Vanilla intro, in addition of playing the game for the first time, was, (in my own history of video games) the best experience I never had. I didn’t know what to do, what to mine, how to repair that ship where I spawn just next to, and all those messages that I was reading, that didn’t make sense to me. What the hell I was supposed to do? help or go? At a time where there wasn’t any community, no buddies to talk to, no help at all… this intro was the most perfect intro I never had. Just me, my problems and 14 billions planets. Which intro could be better than this one guys? I was discovering all at once! The mecanics, 65dos, the blueprints, the Atlas… after almost 2 years waiting and salivating, so allow me not to share how I felt when I finally took of for the first time… 
Than I took a break. At least, let’s say that I didn’t start new saves for the next 3 extension (foundation etc…).
Than came the super hyper high kick with Atlas Rises. The ARG, Emily, the birth of the community and… the new graphics, the new display, the portals… the LORE. Everything completely, and when I say completely, is because everything completely changed. I am sure everyone remembers it, we really had a new game at the time! While travelling in space, new blueprints, cargos, S-class ships etc. I had to re-learn everything, but this time it was with our community as well as my irl friends that I almost forced trying No Man’s Sky (at least for 2hours). And it was a complete success. I wasn’t the one who was talking all the time about No Man’s Sky anymore, but instead of that, when I woke up in the morning, I had messages from my friends asking me how to do this and that haha.
Than came Next. And again, complete MEGA high kick in my travellers chin.
If I add the end of the most epic ARG i never had the chance to play, (got strangely sad when Emily died for Toby)…, Third person view, different Lore, and complete new materials, mining, new blueprints, and so much more.
I started a new game again, because this time it was almost mandatory to do it. Died, died, died and… died again. Fun. Perfect. At last the game got really difficult this time.
I didn’t have the chance to play The Abyss yet, I don’t have the spare parts, I still don’t have my Nautilus. And if I am so slow doing all these things (still didn’t complete the Atlas Quest
, neither the base, farm and technician quests) it is because I love that game so much, that I don’t want to reach a point where I am going to ask myself, ok what will I do now? I did it all already.
But I am not scared anymore, No Man’s Sky got so complete and there’s sooo many things to do out there, that I gonna keep myself busy for at least the next 2 years (counting on Hello Games not stopping to add more content). Do you know any other game, in game history that gives you a total different experience just by turning the music of? …
Still happy to be able to play that impressive game, everytime discovering new things, and still thrilled about what is coming next for all of us.