These are solid! A nice variety with some unique flair for each composer.
Title Screen is a nice, soft introduction. Piano playing is good - nice articulations and whimsy. Supporting strings and accompaniment do a good job of never overtly crowding the playing space; letting the piano melody weave its way through at the forefront, bolstering it from the sides and below. Only thing I'd change with this is boosting the volume just a tad as it is a little on the low side of things, but that's more of a nitpick as ultimately this isn't a major issue for a jam.
The Main Theme reminds me of a slightly more modern arrangement of an RPG theme you'd hear on a SNES or some other 16-bit console. Good progression, nice variety of melodies and countermelodies and the orchestration is nice and comfortable in the back.
Finally, the Credits Theme is similar to the main theme above - same kind of old-school vibes with a little bit more of a modern twist on the production. I really like how it transitions from an almost victorious fanfare into a lull around the mid-section before beginning to crescendo again, gradually building as the end of the credits draw near.
Great work you lot! Well executed and produced.