General thoughts:
Theming on all of your tracks is excellent and faithful to their sources.
Pridemoor keep is a super fun level with some great alt paths and a fun focus on jumps. My main complaint would be the pillar ascent near the end; the springs should really be speedcapped or have something at the top to force the players down because any speed-boosting mod will send you flying path the second set of springs into a long pit fall. Alternatively, have the second pillar be an uphill slant to catch people going higher than usual.
Lich Yard is pretty fun with its alt paths again. My main complaint would be the ending portion having some really tight, blind corners around the bridge supports and making the jump onto the bridge itself is something of a leap of faith. Having a tell above it to aim for would be nice.
Plains of Passage is a mostly smooth track with nice, rolling hills. That said, it does feel a little empty right now in terms of visual flair compared to the aforementioned courses, although the theming is still excellent. I would consider adding a quarter pipe to the far side of the sloped descent into the cave since the turn into it tends to shoot you far to the outside and, if you're unlucky, the pit. I'll admit I was a little disappointed that using the bubbles to jump to the sleeping dragon didn't reveal a hidden alt path on the platform; perhaps an addition for later?
Burning Bone Zone has the best map selection screen picture. Oh, and it's a pretty cool Grumble Volcano-esque track to boot.
How did I know it was going to be Mushroom Peaks? It was bad enough in MK Wii, and now you don't even have air control on half the bounces XP
I would seriously consider adding red springs before every set of mushrooms because sometimes, progress must trump accuracy. Imagine, if you will, a Mushroom Peaks that's fun to play on. It would probably need a downforce on every mushroom to avoid players going too fast with mods, though...
Of course, it's a hell map, so one can only expect jank since half the point is to be faithful to its infamous original.
Just how much was it to commission the track, by the by?