Overall:
Nice game. Personally i found it quite easy, but that's most relative.
Just for the sake of the common sense:
Since when you get out of the line of 2 or more dots it makes you restart, there should be some punishment instead. the fact that you must restart the line when the parts behind appear already welded doesn't make any sense.
She should tell something like: "oh no, now i must restart the operation" and get the player undo the green dots with the opposite tool before restart the operation
about the storyline:
Why should i close a bomb with an elegant panel once is defused? maybe it would make more sense to add another motherboard in the bomb, instead.