peoples have max shoot power in the game. During last boss the time is infinite and with peoples is possible leech for many hours to increase your score with bonus jewel.
after some minuts from the end of time remaining, the small enemies in the screen are very fast and with other ship is impossible destroy them. but with peoples is possible.
I just tried the final boss again. You're talking about leeching the mini-babies? Seems hard to do without also hitting the main baby and eventually bringing on the next form.