Pushing an object out of the way to open up a different path, Consumable Items that give a speed boost, Maybe the runners could open the manholecovers themselves to hinder the other runner
Definitely great ideas! We really tried to push movable elements in the scope of the project but they ended up being bugged in some corner and players being tossed to the nether. The consumable items that you mentioned are already implemented as an extra health (you can use the boost button to speed up but the backfire is taking 1 point of damage).