Break Into . Us (lock puzzle game)

I've made a puzzle game about breaking open padlocks. If you just want to play the game, go play the game. Or read on for the how-and-why of its creation.
About three months ago, my friend Claire, in a WhatsApp group we both frequent, shared a brainteaser:

The puzzle was to be interpreted

https://danq.me/2020/06/27/break-into-us/