One of three things has happened here:
1) The game has multiplayer support, but the two players encountered a bug. If this is the case HG will be quick to point it out.
2) The game never had multiplayer support and Sean's earlier statements were lies.
3) The game was planned to have multiplayer support but it was quietly dropped.
Given HG haven't jumped on this, I don't think it's 1). I really hope it's not 2) because that would be extremely poor form on behalf of both HG and Sean. I'm leaning toward 3) but if so it disappoints me that HG didn't have the collective cojones to own up to it. Having said that, implementing support for players to meet up in-game always struck me as being a lot of work for something that was always intended to be highly unlikely. Even getting to the point where you can see another player's avatar isn't straightforward, never mind the work involved in creating backend lobby/instance code that's robust.
Anyway, regardless of the multiplayer support, nothing I've seen so far really points to this being a £40 game. It's been hyped to oblivion so it'll sell well at that price point, but I think I'll be waiting until it's on sale.
What would be the point to build a "base" in a game that's main goal is to reach a distant point (the center of the infinite color cloud)?
The nesting instinct is strong in some!