So uh... I think Sopwith is older than any of these? (1984)
https://www.pcgamer.com/the-80s-and-90s-pc-games-still-unbelievably-being-updated-today/
So, discovered yesterday that the movement code in SDL Sopwith had been broken for 20 years https://github.com/fragglet/sdl-sopwith/commit/ab5ad8d869d4fe946b9ff98a5169668e6708565a
SDL Sopwith 2.0.0 is now out