Awesome work rdb 
I tried the demo and it seems to be pretty smooth. 
The loading process and pointerlock worked fine on Firefox 44 , very slick experience like Unity
How much work do you think remains to get WebGL as valid deployment target ? I would like to use Panda instead of Unity, but I don’t know if Panda is " ready " just yet. 
I tried downloading the compressed archive but for me at least it seems corrupted ?