I know it's a Japanese game, so it has to be censored in Japan, but FAKKU is not a Japanese company, so it should be able to publish the uncensored version. Honey Select is also uncensored, and it's by the same developer, so why not this one?
FAKKU is the publisher of Honey Select, but not Koikatsu Party. While we produce nearly all the commercial manga on the site (books and magazines), the majority of the games/doujin found here are published by other companies, and it's up to said publishers to decide on how to deal with the question of censorship. We're simply distributing the items, similar to how not every game on Steam is published by Valve.