Great job SS! Sawrfing took me 3 hours by itself (Mike and I had remarkably similar experiences for our first plays of the Quickie games), but it was a big "level up" moment. I definitely recommend moving on to Quickie World 2 when you're ready, it's a little easier than the first one, as well as more fun (at least, I think so). Quickie 2 is my favorite game I've played this year by far.
Neither of us have played Moo World though, keep us posted on that!
I have one final level left in Little Mario World. The difficulty definitely picks up in the later levels, but so far I've only had one that took me an hour. If I ever play this hack again, I don't think I'll do 100%. The switch palaces are fun and I'd play those, but the special levels were not enjoyable for me. Especially the first one, where there's no margin for error whatsoever. The other hacks I've played so far have had at least a little wiggle room in the level design -- you still have to do everything a certain way, but maybe you don't have to jump at This Exact Spot or else you die. You can be a couple of pixels to the left or right. Starting about halfway through this hack, you usually don't have that luxury, which to me ends up feeling a bit too rigid at times. Not everything needs to be that tight!
I'm still looking forward to the final level, though. I should wrap this one up tomorrow, and then I need to figure out what comes next.