I got you 👌
this video explains the tool, then I coded it a little differently to adapt the tool to the existing code but the result should be the same.
I then applied a gradient color that uses the brightest and the darkest color for each fruit 🍊 and applied some transparency.
Then I added a .... we can call it "lag effect" on it: if you look closely 👀 you can see the line does not follow the mouse 🖱️ perfectly at the same speed, that's because the "sensibility" of the mouse movement would make the aim harder.
I hope this answers your question, see it as a thank for playing and appreciating our game 😁