This comes from a NintendoLife review for Retro City Rampage: DX...

Retro City Rampage DX is not quite a flawless version of the game, but it does improve somewhat upon an already solid foundation. With more forgiving gameplay that arguably saps some of its spirit and a complete lack of 3D, the biggest selling point here is going to be its portability. Fortunately that's a huge selling point, as Retro City Rampage lends itself to short bursts of cathartic chaos at least as well as it does to longer play sessions. If you have a 3DS and no version of the game already, this download should be a no-brainer. If you do already have a copy, then it's up to you how much the relatively minor tweaks are worth. Taken on its own merits, though, free from comparison to the earlier versions, it's hard to see Retro City Rampage DX as anything less than a deranged masterpiece.
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Source: NintendoLife