Scale bar, compass and text are have no filters applied yet, so they look more crisp than the overall style.

My coastline process needs some work, I know. I created my landmass by using a threshold layer, I selected all of my landmass, pasted it in a separate channel, then used it as a selection and applied 3px border to it. I have a technique in mind, from Sadoran tutorial.

Wiggly rivers, I agree, that does not make much sense since there are no obstacles in their way.