Fruit Fly
I enjoyed listening to this nice little marimba track. One thing I would suggest would be to either introduce silence in the bass or change the notes instead of holding the same note the whole time.
Nightfall
When the bass came in, I was very unsure of where it was heading and I felt like it detracted from the song. Once the lead came in, the context was clearer than it was, so that's good. One thing I would suggest would be to change the bass layer or introduce a softer and more gentle sub-bass and then add on later in a climactic part of the song. This would allow me to hear where the song is going to go. I also just found the bass difficult to tell what note its playing without context.
Steps of Olympus
I love 7/8! When I first heard this song, it reminded me a little bit of Stone Story's OST composed by Moonsailor. Anyways, I only have a couple criticisms for this one. I noticed that the harpsichord was clipping a lot on the higher notes, resulting in a harsh auditory artifact. Either lower the volume or apply a limiter to cut out the frequencies causing the clippings to happen. I also found the flute to be a tad too dry, so a slight reverb would help boost the space a ton. You can also fill in the emptiness with a soft lush pad.
Thanks WhoIsCthulhu for your submission!