Arduino for STM32

I recently came across this open-source STM32F103-based development board called RedPill001here: https://www.pcbway.com/project/shareproject/RedPill001_994662f3.html
It looks like a minimal but flexible board, based on the Blue Pill form factor but with several improvements in layout and component ...

Many STM32F030 variants use the same die. F030F4 devices can often use 32 KB flash, just like F030K6, by modifying the boards.txt. It's unofficial and not guaranteed by ST, but it works in practice, as your test confirmed.