There are a lot of games centred on World War II, but precious few of them have mechs. I know, I know, historical accuracy etc and so forth, but I like my videogames to have more fighting robots. Alt-history roguelike Grit and Valor - 1949 imagines the Second World War as if it became a dieselpunk battle of steel, and it's playable right this second.
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Dieselpunk WW2 roguelike Grit and Valor 1949 opens beta sign-ups
Grungy new roguelike is a dieselpunk, World War 2 Armored Core
XCOM style robot tactics game Grit and Valor 1949 now free to try