Define "open world". The DS can do incredibly limited open worlds but nowhere near on the scale of something like San Andreas, which was the point nathan was making. Besides that a game that works within the constraints of the system but optimizes what it can do will always be better than something that tries to push the boundaries but spreads itself too thin.
As for the topic, I'd rather Renegade Kid just keep doing their own thing and avoid taking too much inspiration from anywhere else. Half of what makes RK's games good is the fact they're generally quie unique and fill an otherwise untouched niche in the DS library.