I really enjoyed playing it! It would be nice if I could adjust the zoom in and out to make it easier to find planets and know the scale better. Also, I'm still sometimes confused why my orbit is already green but the game still continues.
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If you read the tooltips/instructions, you need all planets to be green but also have the total mass of the solar system to be correct. You can change the total mass and have them all green by making a planet closer or further from the sun, since they would need less/more mass to stay in the green orbit. Hope this helped lol, and thanks for the comment.