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Im thinking of recreating this game in 3D so shadow effects are easier to make (dunno even where to begin adding realtime shadows in 2D, but I guess there is a way using the same method as damocles shadow generator).
For a sun shadow that looks good in 2D you only need a white circle and a shader that multiplies when not over black and you've got your working lighting no matter the placement on the planets. Those planets should then off course be without shadows painted. I could look into this, but like I said, I'm busy atm  ,
Cheers
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