Today Is Not A Good Day, melodically speaking, reminds me of old-school Teenage Mutant Ninja Turtles games (fondly, btw; it really really takes me back ^_^). Something more funk drums wise might have suited this in the vein of Long Train Running, which this otherwise feels like -- to let the feeling of annoyance and frustration really hit hard, and hit home. Admittedly right now the EDM drums are making me already feel less annoyed, so... yeah, communication of feelings somewhere, something something.
Waxing Fun, Waxing Sun does make for a good transitional track and actually feels like Megalovania in parts (a very VERY good thing! Genuinely not sure if you were gunning for that). The modulation you use later on is a very nice touch.
Only thing I'd recommend is, use your dynamics. Play with them note velocities a bit more. Keep your instrumentation sparse to piano and lead for example when you're trying to depict your protag going No I don't want to! with their arms folded -- that's the image that came to my head -- but let the drums and bass kick in a bit more for when the mood lifts, and then let it kick in fully when the mood lifts even further. You do communicate the intent here, but there's more that can be done to communicate the feelings of "things passing from this is a REALLY bad day to actually, this feels kinda nice."
The Best Last Day also feels very old-school TMNT in parts. I do love the whimsy in here, the odd sound effects, and the fact that you do indeed emphasise the main melody with an octave up. This is your strongest track, at least I think so; judging from the comments a bunch of other people think so too. Dynamics use would certainly make this one stellar, turning down the drums in parts to raise anticipation and then fulfilling said anticipation for example. There are tropes we can use even to convey things like "wait am I gonna get the top prize here? .... (long pause) ... heck yeah!", or other such moments. It's these subtleties to look forward to.
Outside of what I've already said about the tracks, this is well written -- very fun, very whimsical, certainly gives the image of a funfair and things going down in it. It was an enjoyable listen, and you should be proud. All the best for this jam!