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Without glowing atmosphere it's darker ^^

But I don't get the problem, that it's visually not distinguished from others. In many games, other objects (enemies or other players for multiplayer) look like the controllable object. When not sure, just press a button, and see, if it moves. When you look at the texture of the planets, which rotate or move, you see, that the motion is working.

The reference of how to control things etc. is written in the

Yes, but enemies in multiplayer games usually aren't rotation-invariant objects. They face you and you face them, which is a clear visual indicator. However, that the planets aren't visually distinguished is only really a problem for me because the planets also tend to lump together and move so irregularly and rapidly. This makes it very hard to detect the effects of your input.