Using a music box as the primary instrument gives this whole soundtrack such a nostalgic, childlike vibe. I definitely get Undertale vibes from the super staccato, moody piano chords that play backup for all these playful sparkly bell-sounds.
The stutter-echoes you use to accentuate important phrases really stand out, too – do they represent something specific in your narrative, or are they just ear-candy? :)
If there’s one thing I’d like to hear you polish up, it’s the mixing. Particularly on some of the higher screechy synths and drum parts (as in Battle v2), it feels a bit like you didn’t have time to do a last leveling pass to make sure all the instruments are playing nice together.