So by that rule any games using only mouse input (as long as there is only left click) are qualified. That makes for most “point ant click” and “drag and drop” (card games) games.
Of cause this is your jam and changing the rules after the start is stupid anyway, so we will just go with it. However if you are making a game for this jam I challenge you to only use 1 key. No mouse position. I will definitely do so!
But most importantly have fun!