There's nothing wrong with making something that somebody else has already made. Take my platformer, for example. Lots of people have made platformers with stickmen in it.
Oh, and it's always fun to remake a commercial game (as long as you give lots of credit over and over and over again) like Super Granny or something, because then most of the rules have been laid down and you can skip to the thing that we are all really after: programming.
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