Specifically mouse. You gave “Screen Tap” as an example of one button, but we know that moving the point of touch requires no buttons, and analogues controls, i.e. mouse, don’t use buttons for motion.
Huge difference between 1 button being “the sum of all inputs” and “1 button plus non-button inputs” being accepted.
For this jam, “one button” means one single digital gameplay action, not one device.
So inputs like mouse movement, mouse position, joystick direction, steering wheel rotation, dragging, touch position, or speech commands are not allowed for gameplay if they affect the game.
A screen tap is allowed because it works like a button press.
But moving your finger around the screen or using touch position would not be allowed.
I'm not the host but it sounds like they're saying that the only player input that should be used during gameplay (excluding navigating menus/UI) is a single button. So checking WHEN the player clicks their mouse or taps their screen is fine but using the LOCATION of a click would be against the rules from my understanding. Think flappy bird for example, it registers your taps but WHERE you tap on the screen has no bearing on gameplay.
