Nice! Not really my usual kind of thing, but it's well-done

Getting serious Kenny G vibes from this. The little slowdowns really add character to it. The different parts really complement each other whilst retaining their own individuality, and the little touches, like the little bits of backing sax in the second verse, give it interest. You've put a lot into the details on this, which is awesome. The individual sections of the song - the choruses, compared with the verses, the bridge, the prelude, the outro - each have their own feel and they fit together well, giving the song a real sense of direction and flow - I get the impression you gave a lot of thought to how you were going to structure this, and it definitely paid off.
I'd say that for me, when the percussion kicks in, the bongos seem to stick out - possibly a little loud, or maybe panned a bit too far out? Not sure. Same with the shakers in the final verse.
In the bridge and the final chorus, the crashes seem to end a little abruptly, which I found made them stick out and distract from the other things that are going on. Personally, I'd probably either add a bit of reverb to the crashes, and/or just let them ring for longer; if you're worried the second option would be too obtrusive, maybe turn them down a little too?
It feels like a cruel thing to pick up on, since it's such a hard problem to overcome unless you play the instrument(s) in question, know someone who does, or have money to spend on huge sample libraries, but it's pretty obvious that the sax isn't actually a sax

It's not bad, but I'd definitely recommend either finding someone willing to record a sax part for this, or else play around a bit more with individual note lengths and volume. For example, at around 1:08-1:09 when you have the two notes played one after the other at the same pitch, perhaps if you put more emphasis on the second than on the first, it'd give the individual notes more variation, and also slightly more accurately mimic what it'd sound like if a saxophonist was playing the piece. This is a slightly more in-depth and pain-in-the-ass one to implement, but when you've got long notes, like on the backing sax at 1:31-1:33, it might help to increase the length of the notes a little, and add variations across the length of the note: perhaps some subtle volume swells and a little vibrato/tremolo? A lot of the 'sound' many saxophonists go for - one that gives a lot of warm gooeyness to smooth sax parts especially - is provided by altering the pressure of their lips as they play longer notes, leading to vibrato and trem. Often players do little pitch-bends up at the start of notes/phrases using the same technique, so that might be worth considering. It's not a major problem really - more something I noticed initially before I really got into the song, and something that if you really wanted to add an extra layer of polish (and had far too much time on your hands!) you might want to consider.
The Scootaloo sample in the middle is sweet, but it feels a little less like it's part of the song, and more like it's been placed on top to me. It seems (I'm saying this about a lot of things here, and I might well be wrong - second opinion, anyone?) that it's a little too loud, and also a little too dry -- maybe if you added some gentle reverb to the sample, it'd fit in a bit better? Couldn't quite tell for sure but it sounded like you lifted the sample straight from the episode, with the episode's background music still present in the sample. It doesn't clash with the song, so it's not necessarily something I'd worry about, and this might be something you're already aware of, but if you wanted to replace it, vocal rips from the episodes without the other audio tracks are available
here.
Out of curiosity - you posted some lyrics for this, is this something that you're hoping to find someone to sing for?
But yes. I really enjoyed this, and the criticisms I gave were mostly pretty minor I think. Good work anyway
