Please make sure to double check your edits before submitting them, especially when importing or using automated tools that are prone to making errors. Most of the buildings added in your edit are okay, however several were traced incorrectly and should be manually redrawn before uploading.

Examples:
https://www.openstreetmap.org/way/1420107846
https://www.openstreetmap.org/way/1420107832

When in doubt, do not simplify: follow the outline as closely as possible.