Not that much is crab
I feel like for a game called everything is crab, there aren't many crab things. The bosses are all crab related, yes. But there are only 9 evolutions that have an effect on the carcinization stat and they aren't needed to get a good run. The whole meme with carcinization is that everything becomes a crab but you can get along just fine without a single crab evolution. I don't want to complain really, I love this game. I just feel like it's a sort of missed opportunity not to have more incentive to go crab or more ways to do so. Maybe I'm missing something.