For progressing through the base game, the card game is not required. It is linked to secret stuff. The rules are technically explained but you have to find the guys who explain them.
Thanks for the reply! Btw not long after making that comment in 2023 i stumbled into your other work, and subsequently fell into a rabbit hole of cool independent games from the early 2000s. And i just wanted to say your stuff is really cool and I'm a big fan, I also enjoyed how kind of obscure it has gotten nowadays, there seems to be no one who mentions stuff like Uin or La la land (which is a shame). And those games were very interesting. Like Adrien Dittrick said below, if you ever pick up any social media please link them up somewhere! It'd be cool to know what you're up to creatively (if anything). Are you making something these days, if I may ask?
P.S. it's really cool that you updated the game after all this time, will definitely try it out again. What caused this sudden comeback if I may (#2)?