These are so good and clean, as is expected from you! The SMW sample ones are mixed so well, and so crisp, while the ports with external samples sound like MP3s, like Tahix said.
Commenting on the songs that stood out to me:
Wrecking Crew Bonus's instrumentation is delightful, and makes me think of an Official Nintendo Remix from the SNES era, like SMAS... except better because pitchmod.
Sky Chase Zone and Chemical Plant both sound so neat, I like your instrument choices, especially for the latter! The brass instruments are so lively, while the bass is crisp and fitting for the song.
Cursed Pumpkins sounds very Pinci with its usage of @5 and generally groovy rhythm.
Ice Ice Outpost is so crisp and high quality. I don't know what kind of sorcery you did with those samples to get them all sounding so good within ARAM and all.
Hazy Maze Cave has the kind of sound I love, which is when you get SMW instruments sounding really similar to the unrelated instruments of the original. The @13 usage is impeccable.
I am in love with all of these.
