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The number of enemies simultaneously on the screen gets pretty ridiculous in this game, but it's nice that it doesn't slow down like Double Dragon when that happens.
I find that for most of the game the only way I can survive is to spam the jump kick move because it knocks guys down with a single hit. If I do anything else that takes more than single hit, somebody will attack me from behind. This reminds me of how you pretty much get forced to use nothing but the elbow smash in Double Dragon.