just some silly thoughts

it would be kind of funny if there were a seed world about an extremely specialized or parasitic species, something like a flea, a brittle star, amexican mole lizard or some or something from the abyssal depths
also think about a seed world about a species that already has an very efficient biological design, like a crab that are so efficient that a lot of crustaceans of different species are evolving convergently to have the same morphology
it's kinda cool that the descendants of the original seed worlds species never have more limbs than their original ancestor because there's no intermediate evolutionary path between the original state and the new limbs that isn't just a waste of energy or even makes you more vulnerable to predators (if there is one at all)