Very nice showcase Jan! For more immersion snow displacement (leaving footsteps ion the snow) would be really nice and actually quite easy to implement in Godot. Heres a good tutorial video where a separate texture keeps track of snowy vs non snowy pixels + a decent shader for a gradation.
edit: Also happy to make a mac m1 build if that's helpful in any way. Really appreciate you taking the time to make a really good looking Godot 3D show case!!