I have played for a few hours. It has potential, but right now it seems pretty empty. Unless you really like MMO-style combat and slow-ass grinding, save your money for now.
I enjoy the progression elements of MMOs; getting new stuff, enhancing how I look, exploring interesting areas, doing menial tasks for paltry rewards that give me the impression I'm achieving more than I actually am. Are those present?
To some degree, yes. As I said it's still pretty light on content. And there are no tutorials so it can be a bit confusing. But it seems like it might be a game for you.
I have only tried speedrunning in a few games (Braid, Mirror's Edge, and a few others). I like that they become even more of a puzzle to be solved. So it becomes this meta thing where you no longer play by the rules, but examine the rules and try to find loopholes. And then, execute. It's also becomes quite relaxing, in the sense that you repeat the same task over and over.
I get that it's not for everyone. But it is for me.