I have an idea!
So i have an idea for Ludum Dare that kinda matches the theme. So , you are the player , and you must rush through various stages with a lot of obstacles with parkour. Here is the catch : You will have a fatigue meter and as it increases , the alpha of the obstacles decreases , making them harder to see and eventually invisible. The player can pick up sodas to decrease the fatigue meter. The faster the player completes the course , the bigger the score bonus. So its pretty much , the more the meter fills up , the worse the level gets. I am thinking of adding coins so the player at the end of each course can purchase updgrades like , faster movement , larger jumps or even slowing down time.