Let me start off by saying I really like how this sounds! It’s a great OST, nice job :)
Not really feedback on the synth part you wanted, but I want to mention: using an exotic scale (or an augmented one? still exotic imo) for Night Drive is a very bold move, especially since it doesn’t sound that dark with the major third it uses here and there. It’s mostly a mysterious feeling, which I guess you were going for too. Rough Streets has a section where it sounds major-y too, when the synth is the only instrument playing, by the end of that section. A darker scale to use could be the harmonic minor, making use of that major 7 scale degree; though that could potentially become exotic too if combined with the minor 6 scale degree (they form an augmented second interval, the cornerstone of all exotic-sounding music).
The melody of Night Drive is what I guess makes it lighter or brighter in my opinion. Then again, I don’t have much ear training haha. I would have to transcribe it and analyze it, and I’m already listening to all the other submissions lol
For your first attempt at synth and electronic music, it’s awesome! You’ve done a phenomenal job at understanding the genre and replicating it. Congrats!!