1. Bees are the humans (or any other living civilization in the universe) who live in a hive ( i.e. planets), whereas, wasps (esp. parasitic wasps) are the super-powered alien beings (like Brandon) whom invade other hives (planets) to propagate themselves.
2. On May 24th, 2006: There were six comets that were seen above Brightburn, Kansas; one of them landed on the woods near Breyer's farm. The crashed spaceship seems to be programmed to broadcast a code that translates to "Take the World" when the designated occupant of the spaceship (i.e. Brandon) grows through puberty on Earth. Hence, Brandon manifestation of his powers throughout the movie at 12 years of age: high intelligence, super strength, super speed, laser vision, and flight.
3. The five other comets could be spaceships send towards different planets or to five different locations on Earth. Their occupants could have similar powers like Brandon with the same goal of world domination through inter-species breeding. This is hinted several times when Brandon becomes infatuated with Caitlyn (the flowers and the music).
4. The end credit scene shows a conspiracy theorist talking about other super-powered beings on Earth; which include the evil version of Aquaman (somewhere in the South China Sea), Wonder Woman (the witch woman that chokes people to death with ropes and cords), and three other pictures of unexplained beings (most likely the evil version of batman/martian manhunter, flash, and cyborg) in the guy's video.