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I donno if the issue is that I'm using a laptop, but it's not obvious how one turns without the mouse. I'll maybe find the mouse more intuitive when I'm not using the trackpad, but it seems to have some mode for non-mouse control.
In case the poster just needed help with the default settings:
lower case a will turn left
lower case o will turn right
As for a feature request, maybe the client could make it easier to discover the basic controls.