I can definitely understand that impulse, but I don’t think a convenience feature like that makes the puzzles easier, it just helps a user who already has the right idea get there faster. It doesn’t help the player decide where to start or what path to draw, but it does make simple mistakes less punitive. In the end if that doesn’t achieve the level of difficulty you’re looking for I’d advocate for more complicating mechanics, not a less forgiving interface. Just food for thought, I guess.