I saw this game today (Rust/WebAssembly) and it looks interesting.
https://sandspiel.club/
an older version:
https://maxbittker.github.io/dust/
blog post
https://maxbittker.com/making-sandspiel/
This was linked to in the post:
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He explained how it works at the meetup last night. They recorded it, but I don’t see it on YouTube yet.
Here’s the talk:
Dang; I’m kicking myself for not dragging myself out of the house for this.
Watching it now with my coffee! 
Edit: the audio is really poor at the start, seems to get better around 16m in when he puts the mic on the stand