Day 10 is up and we are all done! Thanks to everyone who participated!
After a super fast start, the video views slowed down a lot, so we didn't end up crashing the game. And the final challenges actually ended up being somewhat easier than the early challenges, as I had expected the engagement to continue vaguely linearly over the 10 days.
If the video somehow picks up and goes viral in a months time, I'll add a new challenge or two just for fun :)