A 0h gamejam can work only during the Daylight-Saving-Time period, in which the time is set back one hour, essentially "consuming" an entire hour. This allows doing stuff in negative time, which was used to create a game.
For this game, I started using golang, as I was kind of interested in it at the time. I completely mis-estimated how much I could do in one hour in a language I hadn't had any expreience in, so the end result is super minimal, but something that works (on all platforms!).