Nice concept! Here are some possible improvements:

• Make the city less spaced out. It's too big. It takes forever to get anywhere, especially since
• The car is too slow. Let us speed up and slow down.
• The car isn't controlling like a car. It's not supposed to turn on its center axis like a pedestrian.
• Often, running just causes my character to jog in place.
• Let players advance conversation with keyboard keys. Don't make me use the mouse if you're going to lock it.
• Let players move around during conversation.
• Remove or shorten time-wasting fades-to-black and possibly some other stuff.
• and most importantly, ADD A SAVE FUNCTION.

Also, consider switching to a different engine than Unity.