hey, thanks for checking it out! And fair point. I might update soon with some optional rebalancing for a higher difficulty — for now, I would say take -2 distance anytime you allow a spade to fail (that is, you don’t save the corridor by spending 1 fuel). This is in addition to the -1 distance you’ll also have to spend when you move from the spade onto a new card (as the corridor is locked down and jettisoned out into deep space behind you). After all, that’s a pretty noisy affair.
It helps make fuel more precious and consequential, and thus requires a bit more balanced luck on your path. I hope that offers some more challenge!