Getting to Cygna after closing the last hole

After you close the final hole near the end, if you click on the left to get to Cygna, at some point Bobbin will hit an invisible barrier and will move down. So, instead, start by taking a diagonal to the bottom left, which saves up to 1 seconds. This is easier with "screen reposition instantly" enabled, which is exclusive to the EGA version, but it's possible in the VGA version as well.