Hello/ Thanks for mapping. Sorry that it takes a while before reviewing your work.

Keep an eye on complex buildings. Especial the high rise (multi story) buildings and buildings which shows their side views as well. Check this footage how to map these buildings 
https://www.youtube.com/watch?v=dsfUcslLtVc
https://drive.google.com/file/d/13RTwH7sChRWrG5bIjysF2ripBgh3F5l4/view?usp=sharing 
Another issue.
Please square each rectangular building with the Q key while selected.
Do not connect nodes of buildings to other features, roads, other buildings.
Buildings with a gable roof are basicly rectangular, from the satellite they are taken under a certain angle. Then you will see both the roof and the sidewall(s)
https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Ftse1.mm.bing.net%2Fth%2Fid%2FOIP.TlT-Mgq8Quv-2tITDBSQaQHaFm%3Fpid%3DApi&f=1&ipt=e904763ea2d73090cf243655c6020c222cdb475583dbfe58cca9bb97b3d7a292&ipo=images
Best regards and keep mapping
