Nice to see you added the Marquee-Scroll animation with the last update!
The behavior speeding up to the right when scrolling down and to the left when scrolling up is perfect for still elements because it feels synchronized. However, it becomes a bit jarring when applied to moving elements, since the opposite directions create a sense of friction.
Could be an idea adding a checkbox to apply the speed factor only in one direction, the same direction where the marquee is moving? Like the sample page above: https://vucko.co/approach