That's not an evolution of the genre. Guardian Heroes did it in 1996. There hasn't been any advancement since then. Really, GH made pretty much every other beat 'em up look like a joke.
It didn't scroll on a psuedo 3D plane, though.
It used multiple 2D planes.
That's not really the same as a Beat 'em Up.
The spacial dynamic is a major thing.
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