This game was a lot of fun! The gameplay flows really well and all the visual and audio feedback work very well, especially when you make a typo because you immediately know you need to correct it. Another small thing I noticed was that typing Space when the textbox is empty does nothing, which felt great because I have a habit of pressing Spacebar after every word hahaha
As others said, I also struggled to read the road names when the units were over them on Normal difficulty. Perhaps this could be solved by drawing the road names over every other text, maybe bolded so it's even more visible.
The only thing that left me a bit confused were the calls saying it's already past midnight for them. I checked them twice, but nothing seemed to really happen, so I was confused about their purpose. It didn't impact gameplay negatively, but it did leave me curious.
Overall, amazing job!