I know nobody will play it despite being free but you can just go to their official site and download it:
https://holoearth.com/en/download/
Here is Ikko Fukkuda himself explaining the 3 cores aspect of the game on the latest update video and it has English subs:
1-Virtual Lives so you dont have to travel to see them
2-Avatar System for a social game aspect
3-Sandbox game (PVE for now)
The following Updates (1.0.0) include: Users being able to sell their own Virtual Items with their own designs and the Hololive Production official Shop opening in game (this should have been day one but ok i guess)
And then about updates they talked about for the Future:
-Holomem finally being able to use their own 3Ds for the game (another thing that should have been day 1)
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-Tracking Mode like the one that Gook game has
-Kemomimi options for the custom avatars so you can create your own Pekora clone
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- A mobile version with less features than the PC version
-New Concerts and Meet and Greets but this time instead of being a 3D Triangle you will be able to use your in game avatar
-More stuff for the Sandbox mode
-Collabs (The most WTF one)
Not a sign of this game having a story for now
The game its free and sustains itself by their userbase purchasing cosmetics