Think about it - a rainbow field appears, it mutates everything, turning normal stuff into some abominations. Reminds you of anything?
A tradwife with a masculine military man loses him to the RAINBOW.
A bunch of "damaged goods" as they self identified women also vanished, consumed by the RAINBOW. It's pretty clear that the authors hid the message in the movie, that is actually so obvious no normie could figure it out.
Also - a lighthouse. A structure that's supposed to warn ships of the danger of the coast.