It felt like the opening segment of the boy finding a dead body under the water was significant foreshadowing suggesting impending doom waiting for the kids. Also, I couldn't quite make out the point of the starfish amputation scene, maybe this was suggesting that starfish grow back from amputated limbs and that the women were all disintegrated parts of the same starfish/creature now humanoid. The theme of boys being scared of sea creatures is curious and the most awkwardly staged scene is them burying a creature fingernail deep in pebbles (what was intent of that scene?). The scene of naked bodies in starfish shapes suggests a deeper connection to the starfish. It seemed like the women didn't quite know what they were doing with the boy, experimenting on them with some failures and seeming to be very curious about the gestating implantations. When they were watching the c-section video I almost got the sense they were surprised by this possibility and reacting by mistakenly implanting into boys just because they didn't know female mammals carry fetuses. I imagine the idea of cutting open a body that won't regenerate might seem really foreign to starfish creatures (assuming they are starfish like creatures). Since they were all girls it makes sense that gender was intentional and important but I can't figure that. The photographs of girls with suction cups all seemed medical/scientific suggesting they were in society and considered outsiders. At one point it felt like the sympathetic mom was surprised the boy could not breath underwater (maybe she expected he would due to experiment or felt like she could so he should). Parts made me feel like the starfish women were trying to implant themselves through the boys physically but the boy was implanting himself on the sympathetic mother mentally/emotionally.