Cool to see a lot of first-timers, myself included. I'm still working on my first game, but just saw info about the jam couple of days ago and figured out that it's worth a try even if a game I make for this will suck big time.
About the 10 days limit, I agree that's quite a lot of time compared to some other jams, but it's also worth keeping in mind that people go to work/school/whatever so like for me it's effectively going to be a lot less time, in terms of hours spent on the project it's closer to like a 2 day jam. And I guess that if you've never done it before the time constraints can be intimidating.
Let's all just have some fun.