STM Microcontroller burns every time
VDDA is not connected.
Application note AN4325 Getting started with STM32F030xx and STM32F070xx series hardware development says,

The VDDA supply can be equal to or higher than VDD. This allows VDD to stay low while still providing the full performance for the analog blocks.
When a single supply is used, VDDA must be externally connected to VDD.

So, connect pin 5 to pin 16 before trying again.