Wow! the nighttime track is really well done, the guitar sounds fantastic! you nailed the lo-fi vibe while still giving it your own color and adding in the (imo superior to traditional lo-fi) elements of ambient music! Well done!

Great vibe and yeah I guess summer nights can be like that. The dawn track is cute but felt kind of forgettable imo. I really liked how you constructed the ambience in the night track, good work!

The ambient insect noises in the second track were great for making the summer night atmosphere work.

Great job setting the atmosphere. It would benefit from having more identifiable motivic ideas throughout, to help make the tracks more cohesive.

The night theme is beautiful and evocative. The guitar work there is a joy to listen to. It is the stronger of the two tracks by far.

The dawn theme, I'm not feeling as much, but at the same time it does give me a sense that there's more activity going on.

For an OST, what kind of purpose it serves is very open ended because well, there've been no story details except for that one twilight photo of traffic on the submission page. If I were to consider just that photo alone, both themes do fit that setting. Just that I'm not quite sure that's your intent, because nothing else was mentioned. (Assuming that is your intention, that it's all set in the backdrop of this city picture, it works.)

All the very best in the jam!

That guitar work in Night is so emotional and pretty sounding, awesome work. Both songs are great 

Really beautiful! Great job!