Don't get me wrong, this is a simple demo but there is a deceptive amount of stuff going on with this little game that the devs haven't telegraphed at all. Half the fun was finding this stuff out, so I'm reluctant to say more.
SPOILERS(?) BELOW
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For a start it's fully a multiplayer game. I'm not sure if that is mentioned anywhere?? It took me a few minutes to find out I was sharing the game space with a handful of other players. There's extra mechanics around that which aren't explained but were fun to discover.
Honestly, wondering around the map with 3 other little guys who I couldn't communication with was surprisingly fun (shout out if your reading)
I don't want to be the "all indie games are about capitalism or depression" guy, but stumbling across the pyre with another player recontextualised the manual-labor game loop for me and was a bit of an epiphany. I don't know if there is an end screen but I wanted to stay listening to music with my mute friend forever instead of returning to lugging rocks, which is obviously the point.
If I was being extra pretentious, I'd say even the lack of available emoting/communication speaks to the inherent isolation and loneliness of a certain socio-economic system.