Especially consider shooting across the circle if you see red stars, because they only shoot backwards in a V. Sometimes you have to shoot across from the other side of the circle. I find stars that I know are targeting each other, and try to find the stars that are needed to hit them to set them off, and then work my way back to the first star. In my opinion, back tracking is the secret. Where does that have to get hit to hit the purple star? Trace back till you can't, then give it a shot. Where does the purple star have to be hit from to hit it's target? You trace it back and you'll find another star sure enough. This is a good place to start backtracking. That means that if you see a blue that shoots perpendicular and a purple aiming towards that, the purple can only be hit from one direction to make it hit it's target. Second easiest thing is the purple stars, because they only shoot to the left 45 degrees. That's a good pattern that you've found something. So if you see lots of blue stars making right angles with each other, such as boxes, or L's. Look for patterns! The easiest are the blue stars, because you know that whatever angle you hit them, 2 mini stars will shoot out the sides perpendicularly. This is my strategy I use to solve puzzles. Alright, although this is in no way the complete end-all strategy guide, hopefully it'll help you.

Starshine legacy game