Depends on which way you take. If you make a freeware remake, then nobody would probably mind and then you could probably copy most of the aspects of the game and boost it up with different graphics.
If you make a commercial release, then you need to make something different. You could probably use the same basic idea, same types of minigames and such, but it needs to be different from original. Like compare the original Pirates! to the 2004 remake, thats how a Sword of Samurai remake could be done.
Also, if you go commercial route, you can call it "Inspired by Sword of Samurai" and stuff like that, but you probably cant call it Sword of Samurai. I'd recommend "House of Samurai" instead.
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