Well, I didn't have a Stencyl adventure of the kind that AdventureIslands had, but things went both right and wrong for me too.
To begin with, this was my first time ever participating in the Ludum Dare, and it was even tougher than I had imagined. I mean, this was my second time ever making a game; if not for Stencyl, I couldn't even have dreamed about making it. This is also why I didn't make a game for the Compo, but for the Jam!
Well... As soon as I heard the theme, a simple (luckily) idea popped into my head. Here's the originall skiss that I drew in a couple of minutes:

Anyhow... This time I could work far quicker than when I made my first game, as I had more experience with Stencyl. The first thing was to figure out how to actually make the simple idea a reality. My game was heavily inspired by SHIFT, which is a quite well known game (series). I decided to do things a bit differently, though.
I still don't know a lot about programming, nor do I understand all the features in Stencyl, so I had to work around things in my own way. After a while I figured I'll just use the middle of the screen (vertically) as a point for comparison (you'll probably understand what I mean if you play the game). I also decided not to flip the gravity for the other character, as the gameplay wouldn't have been that fun, I think.
I couldn't really do what I wanted by using tiles (there's probably a simple way...), but I used actors for everything, and it kind of worked.
After this, most things ran smoothly. I only ran into one more issue, and I wasted 3-4 hours on something I could've done in 5 minutes. It's so stupid that I don't even want to say what it was.
Once again, I feel I made the game too difficult, and I still need to fix a single thing in the very end (after I'm done making this post), which is a small bug I only noticed today.
I'm not entirely pleased with the music, but considering the time limit, I'm content.
The game is not great, but I'm happy with the result, and I had a fun time, which is the most important part for me

The game page can be found here, for those interested (it's also available in the Arcade):
http://www.ludumdare.com/compo/ludum-dare-29/?action=preview&uid=36305Overall, it was a fun experience to make the game, and I'll probably participate in future contests! :'D
How did it go for you?