Hey, thanks for playing! I'm glad you enjoyed it! As far as times, anywhere between 3 and 9 minutes seems to be pretty common, so yeah nice job! My best was probably a bit lucky, around 2 minutes 20 seconds. I'm pretty sure sub 2 is possible, but requires some really clever input near the end.
I'm happy to know the vectors were useful, too! I added them as a debug feature while I was modeling the rowing forces to make sure I was getting the right result. I figured if I needed help making it, it might not be bad to give the help to those playing. It was super easy since I already had the math done and GMS2 already has a draw_arrow(...) function--don't know if I would have done proper arrows without it, haha!