[pierrebai]

Looking at the code, "maintainability" is quite relative: it might be maintainable by the original author, but the code has no comment and is chuck-full of magic constants without any explanations. Or'ing this hex value, and'ing that other hex value, etc.

[bubblyworld]

To be fair to the author, there is a ton of inherent complexity to something like this that you can't really smooth over with "readable" code. I think you'd have to spend a lot more time familiarising yourself with the codebase before making a call on whether it's maintainable or not.