This is very nice and relaxing! I like the assortment of instruments you went with here. The key change at the end is a great touch too! I really like the sax melody that comes in, I saw others mention it was more present than they would've liked. I personally don't have any issue with it and I think it sits well in the mix, but if you do end up making a version without it, I'd recommend testing a larger low-pass filter to darken the timbre and see if you like that before removing it outright. Can't just have that insane melody leave the track!
Also I like how the cat too tired to play it's little mice game, very adorable