We just updated our submission with  the web export, we didn't trust that physics based game, would have worked, and actually it does work. 
https://itch.io/jam/falling-block-jam/rate/3898593

So we wanted to share with you this news, even if I understand is late in the timeline of trying out game :D 

Aaand good job everyone, we've been playing some games. Really enjoyable game jam and submissions !