The shadows can be improved in the Project Settings->Quality section. Set the Shadow Resolution to 'Very High' and reduce the shadow distance to whatever looks best for the game (smaller the distance, the more detailed the shadows will be). Set 'No cascades' too... Hopefully that'll make the shadows look better in the game. Also, on the shadow casting light itself, just reduce the strength a bit so they aren't as dark.
Alternatively, considering you're on a flat plane and the asteroids are mostly spherical, you could just cheat and render blob shadows for things, which will be a lot cheaper and also kind of look nicer in the end...
As for the screens, yeah, it was all of them - they always appeared behind me, not sure why? I tried resetting the view, but still had the same outcome. It kind of looks like it's displaying the menu in the opposite direction to what I'm facing for some reason...