FilePilot is made by single developer, Vjekoslav Krajačić, public since Feb 2025:

..Next-gen file explorer Engineered entirely from scratch for light-speed performance, featuring a modern and robust interface

2.08MB size, handcoded and extremally optimized 'alternate universe'

£32 personal license, plan to offer Source Included as a separate purchase.

https://filepilot.tech/ https://www.youtube.com/channel/UCSZsgOOTYWadgPR-Ajxn86Q

https://news.ycombinator.com/item?id=43091466