Infinite space would be limited by computational constraints.
Sounds too simplistic to be fun. Probably broken because players who've accumulated a lot of money/power always win.
HTML5 limits what you can do. I'd add fog of war and planetary exploration.
I dont think infinite space would really be a problem, as it would only show / calculate based on areas that people explored. fog of war was touched upon in the mention of 'beacons.' Players would only see stats on areas they occupy, and thus, only spots that have been occupied would need to be created. It's the same logic thats found in minecraft..they only build whats necessary for the players.
The whole idea is that it's not supposed to 'simplistic' but represent a large economy within a world thats mysterious. Owning property/shares of buildings, charging other players money, collecting money, owning population of specific areas, etc. It's a niche, of course, but something anyone could get interested in given enough of a push into understanding it.
There is no winning, so no one will win. If some player takes control of a specific area, new players only need to travel to a brand new area and start fresh.
But, theres certain benefits of living in a constructed colony...They would have space ports, they'd have population, they'd have mining operations, etc. You could theoretically work for them if you wanted to in order to get off the ground.
Part of the appeal, i think, would be the fact that you don't know whats going on in the other side of the universe. You and your group might think youre hot stuff, only to find out that a bigger group outclassed you 1000 lightyears away.