I gave it a quick go and very few things work at the moment. None of the programs you listed do.

From the README:

  At the moment it can render simple applications that do GLX, EGL or Vulkan graphics (fully hardware accelerated) nested in an existing X server.

And that sounds about right. As far as I can tell it doesn't yet have a lot of the core X11 stuff that "normal" clients expect. For example xterm doesn't start because requests like X_AllocColor, X_OpenFont, X_PutImage (a few picked at random from the error output) are not implemented yet.

glxgears on the other hand does work :)

It’s possible that most of old X11 toys would not work properly, because many of them rely on X11 drawing APIs, but they are pretty simple to implement anyway.

motif apps? xmag? xfontsel? forwarding over ssh? ~/.XCompose? "links2 -g"?