You are right, keep on pressing space button again and again is a bit embarrassing. I tried to drop it but it seems to be a bit lack of feedback... In fact, at first I planned to make it an rhythm game,player should try to get the right time to press, but there's no time to draw the UI so I gave up. Let me think about whether there is an better optimization solution, or maybe it's better to remove it,just as Occam's Razor tells us: Don't add entities unless necessary.