Thank you very much!
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The flickering happens, if the stars are far away and you or the stars are moving.
In the latest version, which I will upload at the end of the two weeks rating phase, the flickering is reduced due a rescale of the game, but not completly gone. (1 Lightyear -> Not 1 but 0.01 Units) This also fixed the black screen bug, if you have gone to far from the center.
The gameplay itself did not really changed, but it's less of a struggle to move the player black hole. It's still force based moving though.
So, thank you for your feedback!