You are very welcome to record and stream playthroughs of my maps! Please include a link to this thread in your description to help people find the map for themselves. Feel free to post the first episode in this thread so that I can watch!
What difficulty are you playing on? The timer is more forgiving on lower difficulties so if you're playing on hard/medium you may wish to set it to Easy If you still can't finish it in time you can run the command `/function racecourse:victory` which should also spawn the wool box