Ahhh that one yeah, the castle is a sort of mini "Foddian" section which is why there is only that one checkpoint. However, I was considering adding a second checkpoint after you do the two jump pads in the wooden side section (where you jump through the holes). I may end up doing that at least since that's roughly half way up :) Thanks for the info!
As for a tutorial, there "is" one, but it's more so the starting area and the signs, but they can be ignored/not seen so I need to do another pass on that for sure!