Not sure what I'm doing, I've been exploring but nothing other than collecting rocks seems to happen. Fell through the world once, got stuck in a pit another time, got shunted back to the main menu a few times without any indication why. Probably starved, as I only noticed a hunger indicator after a few tries. The UI is tiny.
The game has larger dimensions than the space it gets on the site, so it needs to be in fullscreen to see everything (and interact with the menu at all), but then it's both pillar- and letterboxed such that black bars take up 60% or so of the screen.
Barely playable, so I can't tell how well the idea behind it plays out eventually.