it's shooting not beat em up, but check out Doru's game Dorumeka RyonaWelcome!
I hope you for the best.
As a side note, a feature I'd like to see in a zako game would be procedurally generated enemies, with different body shapes, face shapes, hair styles, eye colours, features and accessories. I'm just thinking out loud, but that's something I'd love to see implemented. I have a thing for variety on zakos. Such a beat 'em up would be awesome.
In any case, good luck with your projects!