>>536179969
You don't have to. Just having a different worldbuilding can lead to widely different mechanics. Persona is a JRPG, but it is widely different mechanically because they put the game in a Japanese high school instead of a medieval fantasy world, so you get stuff like the calendar system and the social link.

>>536180124
Do you think Jumpman was created by thinking abstractly "I want the player to move an hitbox up platforms, and there are hitboxes moving down to dodge"? Or did they think "I want the player to move a character up platforms and there are barrels moving down to dodge"?