Brick measuring tool (replica multi-functional testing pen)

The task requires
replicating a multi-functional test pen (official example: Dianjing CW32 Multi-functional Test Pen - JLCPCB EDA Open Source Hardware Platform (oshwhub.com)).
PCB design instructions:
Considering my limited technical skills, I enlarged the PCB area, making the pen look like a brick (as long as it works).
Physical demonstration
instructions: Provide photos of the actual product; descriptions can be added to the photos. Precautions: Check
carefully after soldering (one of my capacitors short-circuited, and the board got so hot it was almost like a barbecue).
Demonstration video:
[LCPCB Training Camp - Multi-functional Test Pen] https://www.bilibili.com/video/BV1xC4y1j73T/?share_source=copy_web&vd_source=d8536912dfa855a86fc79126a98e3b27
The blue board:
I'm a beginner and didn't know how to use it, and I kept failing to burn the program, so I applied for a U-Tech blue board. The blue board is easy to operate, and I succeeded immediately.