I tried to Revolutionize LED Lights!.....And FAILED?

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Components list: (partly affiliate links)
3.3V Regulator: https://www.mouser.com/ProductDetail/...
5V Regulator: https://www.mouser.com/ProductDetail/...
ATtiny402: https://s.click.aliexpress.com/e/_DDt...
VCNL4200: https://www.mouser.com/ProductDetail/...
AL8860: https://s.click.aliexpress.com/e/_DlT...
0805 Resistor Kit: https://s.click.aliexpress.com/e/_DBe...
0805 Capacitor Kit: https://s.click.aliexpress.com/e/_DmF...
3015 47uH Coil: https://s.click.aliexpress.com/e/_DFh...
LEDs: https://www.lcsc.com/product-detail/L...
SI2301 MOSFET: https://www.mouser.com/ProductDetail/...
FDLL1418 Diode: https://www.mouser.com/ProductDetail/...

Project files: (Schematic/PCB Design/Code): https://oshwlab.com/greatscott/stairl...

The ATtiny Programming tutorial I used:
https://www.electronics-lab.com/proje...

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In this big project video, I basically tried to revolutionize LED lights. That means I wanted to create an awesome led light for my staircase that only reacts when a human passes by and when it is dark. At the beginning everything worked just fine the mechanical mounting as well as the electrical design with uC, LED driver and distance sensor. After the programming and final assembly, everything fell apart. Check it out ;-)

Websites that were used/shown during the video:
https://4donline.ihs.com/images/VipMa...
https://github.com/SpenceKonde/megaTi...
https://github.com/ElTangas/jtag2updi
https://www.electronics-lab.com/proje...
https://github.com/ktsai69/Vishay_VCN...
https://www.mouser.de/pdfdocs/Vishay_...
https://www.amazon.com/dp/B075MB414D/...
https://www.aliexpress.com/item/10050...

Thanks to JLCPCB for sponsoring this video.
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0:00 My Staircase problem
1:34 Intro
2:39 Mechanical Enclosure
4:20 Initial Plan for the Electronics
6:08 Testing the Distance Sensor
7:05 Creating the final Schematic & PCB Design
8:51 First Assembly & Test
9:48 ATtiny Programming & Finished Prototype
10:41 Final Assembly
11:24 PROBLEMS & TROUBLESHOOTING
12:43 Verdict