This is gorgeous from start to finish. The artwork, story-telling through the titles and the music and the write-up - stellar. I'm going to just refer to 'you' as both of you in this to keep it from getting too wordy.
Sunday Funday captures some really fun and dreamy vibes - I love how thoughtfully arranged this. Solid choice of instrumentation and progression. Minimal percussion but it does exactly what it needs to do. The mixture of both piano and rhodes is really good - something I never think to combine myself, despite loving both of those individually!
A World of My Own continues on with that dream-like quality. Great voicings, memorable melodies and the pop SFX sounds are a lovely bit of ear candy. This track, for me, is a great example of a less-is-more approach - the arrangement does not need to be crowded; a thoughtful instrument or two with some complementary melodies will tell a far deeper story than a mix packed to the brim.
The Nurse Told Me to be Good and Come Back Tomorrow is a wonderfully intriguing title, and the arrangement does it justice. It has this kind of cherubic curiosity and reservation to it. I can't quite describe what it is about this track that appeals to me so much but you've captured a really unique kind of vibe with it. Nice touch having the lower-end of the spectrum fill out toward the ending section.
Mommy's a Liar has a strange kind of whimsy to it. It's ambling along at its own pace, striking a kind of ambiguity that is not easy to pin-point. Abruptly ending and transitioning to a more defined forward-moving arrangement was a surprise, but it works well given the title. In comparison to the other tracks, this is very bass-heavy and I think that really works well here. Percussion growing gradually more complicated as the pace picks up is great, feels like that curiosity from before has been quashed and replaced with a kind of sombre, unwanted realization. The use of the EKG beeping toward the end of this piece puts an entirely different spin on it; turning it on its head. Really nice use of subversion there.
Finally, I love you, Mom caps out this soundtrack on a still sombre but more resolved note. A short, evocative piece driven solely by piano to round it all out. It doesn't lessen the blow but makes it easier to process.
This is a special piece, I think. As others have commented - this feels complete as a submission, and its one of the more thematically adept entries I've come across. I love your choice of instruments and way of going about writing them in tune with the story you want to tell. This is wonderful and evocative - fantastic work. I can't wait to see what else you'll do in the future!