Looting chamber XP creeper farm

Creeper farm over deep ocean using snow golems instead of cats, with a kill chamber at the bottom so it gives XP and looting drops as well as gunpowder. Creepers spawn on a flat platform, sixteen snow golems on a bed in the middle knock them off the edge with snowballs, they land in water and drop into the chamber, and you kill them there with a looting sword. Slabs across the whole floor are what keeps spiders out, and that matters, because a spider will aggro the golems and kill them. The concept is MushoDen's, the looting and XP chamber is Shulkercraft's own. It stacks, and each extra layer roughly doubles the rate. Java only. Because you do the killing, it needs an autoclicker to run unattended.

80 of the 96 buttons are for the beacon and only 16 are for the farm itself.
If the snow golems are not shooting, hit the first one you spawn so they stop clumping into a single block.
Put the blocks on top of the fence immediately after placing it. If it rains before you do, the snow golems die.
The video never shows how to add a layer. Break the 5x5 hole in the middle, then add a second row of open trapdoors around the golems so creepers cannot land next to them.
Raise the wall at 2:50 from 3 blocks to 11, so the whole platform sits more than 24 blocks away and more mobs spawn.
Swap the carpets at the bottom for soul campfires if you want it fully automatic, at the cost of the XP and the looting drops.