You pay for infinite somewhere, and what this pays with is variety. Terrain that never stops turns samey, and neither the survival layer nor the building layer is heavy enough to distract you once you've noticed. Lot of world for a browser. Not a lot of game inside it. Worth a look for the scale alone, so long as you turn up expecting a sandbox.
Turns out I didn't want to conquer this at all. I wanted to wander off and put up one small building somewhere, and it let me. Nothing shoves you towards a destination, nothing asks you to keep pace. Slow going, and I minded that not at all.
The world doesn't end, you gather and build in it, survival is on you, and there are other people out there doing the same. Enormous promise for one browser tab. It holds up better as a place to be in than as a game to finish. The open-air influence shows in how much it wants you to pick a direction and find out what's there. Id spend an evening in it.
Generating an infinite world is the easy half. Filling it is the hard half, and this is currently stuck on the hard half. I walked a long way, chopped a few trees, met nobody at all. The building systems are fine. Leading with MMO just trains you to notice everyone who isn't there instead of the craft that is.