Threshold is an action-packed game where you take on the role of a spaceship at the bottom of the screen, tasked with eliminating formations of enemies at the top. With limited time, as represented by a fuel tank that refills after clearing waves, you must navigate this challenge while managing your spacecraft's laser, which overheats with each shot.
The gameplay is fast-paced, requiring quick reflexes to avoid enemy fire and optimize your use of the laser. As the heat bar fills up, you'll have to wait for it to cool down before firing again, adding an element of strategy to the game.