

Limiting the scope doesn’t mean copying. It means keeping the feature list low so that you have something workable in a reasonable amount of time. Otherwise you’ll get overwhelmed and likely never finish.
This is one of the reasons I’m a big fan of the pico-8 “fantasy console”. It nearly forces you to limit the scope of your game. There’s plenty of interesting and fun games on that platform that are heavily limited in scope.
My kids played this co-op and loved it
Seemed like a pretty solid coop game to me!