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!

Oh, thank for your comment. my friend said "Rotates too fast!", so i Set slow rotate. But after hearing your opinion, it seems really slow.. I guess I was impatient because time was short. I'll adjust it for the next update! Thank you.

thx for your comment! I'll try to update what you said. I think it would be helpful for us to move forward in a better direction if you could explain it in detail! Thank you very much.