Does it need to be like "One button" controls or something in the game that is "One Button".

Simply create your game to inherit the theme, can be anything as long as you use the words "One Button" to create functionality, story, controls etc.

We judge the Adherence to the theme as part of the jam, therefore try to use "One Button" in a interesting or clever way.

Hope this helps! Join the discord for staff and community help!