Hi, wondered if anyone would be kind enough to help me debug a silly little number game i made for my youngest daughter. It is a puzzle game where you hit targets by making the longest chains possible to get higher scores. Everyone will get the same board each day and you can share your scores with friends (for my daughter she can play it with her friends and they can have a little competition with each other).
thanks in advance for any help and feedback :) 
P.S i am new to this so sorry for any obvious, idiotic mistakes, of which I am sure there are many.

https://mmquad.itch.io/locklines