I added a BOOT0 pull-down resistor (10k) to the schematic and layout and also made some more minor layout tweaks. Silk screen type size could be increased a bit to 35 mil (was about 30 mil before) and I also increased the supply trace width as suggested in the comments.

Not tested yet, but if you want to try it:

https://oshpark.com/shared_projects/WwATL5iu