Thanks for the tip- the current camera definitely needs a lot of work. I'll look into changing the rotation hierarchy- right now top level node of the player is actually not rotating at all and it is all camera. Making the player yaw rotate would actually help with a few things.
As for the game performance- I've unfortunately been limited to only testing on my machine which performed OK-ish in the browser. I've removed all directional lights but one to hopefully help with performance, and uploaded a Windows build as well.