Thank you for your kind words. Your comment is make me happy. Collision ... It was a bit of a worry.
First, I was use 'Change to World space coordinate From Screen Space coordinate'... But It didn't work properly. I didn't have many time, I had to choose the Next method: That was to create a collider that follows the cursor, but I think the accuracy isn't satisfactory... X(
I'll try to reflect this more in the next update. Thank you!