A very good job; I liked "Endless Adventure" a lot.
The only thing I’d say works against it, is that they feel disconnected from one another—even when they represent the zone's theme and the zone's boss. It doesn't have to be a bad thing, especially since there are only two tracks, and expanding the OST allows for reusing some of the instruments and creating greater coherence.
That said, the melodies are memorable and great to listen to for a good while; in fact, since they’re YT-Shorts, I listened to the loop at least three times per song xd