What do you mean? Among Us and Fall Guys might have uncannily similar designs, but they're very different games beyond that, belonging to totally different genres.
Among Us was inspired by the live party game Mafia, and the science fiction horror film The Thing. The idea for the concept was originally given by Marcus Bromander, co-founder of Innersloth, who had played Mafia since he was a kid. Innersloth had also made the Henry Stickmin Collection.
Fall Guys draws inspiration from game shows like Takeshi's Castle, It's a Knockout, Wipeout, and playground games like tag and British Bulldog.