A remake means the gameplay's the same or improved, just like the game itself. That would solve the gameplay matter, unless you're more thinking of making a tribute to Sword of the Samurai, or a game based upon it. Another suggestion is to check up on the historical correctness of the new things you're implementing, as in SotS, everything's historically correct. That's part of its charm. To keep that, the additions'd need to be correct too.
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