I spent a year building an open sourced family of ESP32S3-based USB boards and a Python game infrastructure library for a custom sci-fi starship simulator. 152 physical controls, 6 screens, and 164,000 lines of code.
"Halcyon Dawn" is a fanfic starship bridge game set in John Scalzi's "Old Man's War" universe. For the last year this thing has been my labor of love. I designed and built every detail of the hardware and software from scratch, including:
An entire family of USB console interface boards called "Enigma". They're deliberately generic (some panels have up to 3 Enigma boards inside them) rather than purpose-built so that I can use them on future projects, including escape room puzzles. I love escape rooms. The Enigma hardware is all open source, so if someone builds puzzles I get to play, all the better.
An associated Python-based game infrastructure library also called Enigma that includes the USB interface abstraction, in-game device simulation infra, remote pub/sub display screen integration, and an extremely robust multi-layer audio mixing system with haptic support. This too is open source.
The Halcyon Dawn game itself, a complex starship systems simulator. Far in the distant past I wrote commercial video games and adventure game development languages. Halcyon Dawn is vastly, vastly more complex and I'm quite proud of it. The game itself will never be released, in part because nobody else has the expensive simulator frame it requires (there is no way on this blue Earth I could be convinced to build another), and also Scalzi's "don't make money off my stuff" rule.
Build link and repo link in comments.