use mouse to dodge the red square. you have 3 lives. if the square goes greyer, those are invincibility frames. top right is score. note that if your mouse is off the stage, it clamps your mouse between -200 and 200, so no cheating (i got to 87438 without that clamp) and if you stay still for 5 seconds, you lose health
i made everything, from rendering to collision detection. 100% pen!