Tested my levels.
6-5 is working great, and is marked as X.
2-E is fine, but the Fuzzy Generators could be moved around so they work right.
3-8 has some problems, but is otherwise okay:
Weird starting position.
...How did I miss that? Such an oversight. Either move the vine, the Ukiki, or just get rid of the monkey.
Oops, you missed a spot, ZeNewDragon. (Item Memory issues, with the Coins and Flower)
Mud Tiles are glitchy.
The closing door for the boss should be changed as well.
6-8 doesn't work. The Spinning Doors need to have their coordinates set, plus the Sprite Sets need to be changed in certain sublevels so the graphics are proper. Additionally, the Kamek cutscene should trigger before that gap with the lava at the edge of the tower, not in it.
R.I.P. eXcavator... You will always have a place in our hearts...