Please add jump-trajectory previews. It's hard to intuit EXACTLY how the jumps will go, so there were several places (especially in the first world) where I'd just barely miss/overshoot the extra-jump items and have to redo a whole section. Maybe make it so that holding the button shows the preview and letting go does the actual jump, since nothing requires the immediate responsiveness of jumping on button-push. This would also fix another issue I had where I'd be too close to an extra-jump item when I pus...