I made a physics engine in Geometry Dash

i know nothing The video suddenly became a hit, so I'm here to reply to some common comments.(by the help of translator, my English isn't that good, sry) Actually I made the physical system two years ago. But I was lazy and I retired at that time so this video didn't come. Now im back and my friend said that this thing will be valued so i put it on youtube. Q:Will you upload this? A:YEA but after my minigame finished.I don't want my creation to be copied before i make it public.I'll do a explanation video after that. Q:Did you use some tools like SPWN? A:No, i know nothing about coding and gd tools, i just back from retiring.i done this in pure mobile gd scale hack. btw, mobile is more comfort for a trigger creator(at least for me), it won't make the creation more difficult. Q:Song? A: Touhou remix:noise canceller By EastNewSound