These two tracks left me wanting more, chords underlying a progression, atmosphere, or percussion goes a long way. There is a lot of space to fill, even with a busy melody.

Both tracks feel like something's off. Dawn becomes better around first minute, but Dusk is extremely hollow. I personally would add something like pad or strings to fill the background, because these moments of silence between the existing instruments are not good. Overall, it's a decent OST

I really would have liked if the instruments overlapped more. They feel so separated and as such make the songs feel incredibly empty.

as it is now, the songs feel disjointed and stagnant because there's only one thing to listen to at a time which makes for a less interesting listening experience.

One thing that I would suggest different from what KGML7 said would be to humanize the piano in the Dusk song as it feels very robotic. I loved your marimba usage in Dawn; it sounded really cool.

these tunes were quite good and i felt that the instrumentation did brilliant to capture the two ideas, however, i think that in a context of an ost, if you have to tracks whose names parallel eachother, you should make the music parallel eachother. for example keeping the same melody but slightly changing it between each song.

 otherwise i enjoyed these :)