This episode is amazing. The gimmicks and locations are so creative! Probably the best episode I've ever seen in SMBX
Edit: Holy s**t, level 24 messes with my head as much as a troll smw romhack would. Also when i beat it i got sent to a nonexistant level, resulting in a deathloop. Idk if that's intentional but knowing the level right before it probably is.
Added in 37 minutes 31 seconds:
There is a mistake on level 17 with the pipe in the room after completing the main task of the level (the one with the toad in it) in which one of the pipes is entered to the left instead of upwards.