Ohhh this is a really good reply, I'm really happy to learn about this! I think I get what you mean, especially about older games when control schemes weren't standardized. You have to really work to learn how to control the character in games like Mappy or especially Pac-Land (which kinda freaked me out at first because it heavily resembled a 'normal' platformer but controlled so differently from what I was used to). It can be really engrossing to just explore a game like that and try to connect it in your head to what came afterwards.