First of all, great job everyone! I haven't had the chance to play many of the games yet, but I am looking forward to it :)
Gonna go out on a limb and disagree with a lot of the points (based on experience in previous jams, namely Ludum Dare)...
- I prefer to do game jams solo because I enjoy the absolute freedom. I also personally enjoy working on all of art, code, and game design, and sound assets are easily purchasable. If I had a "partner in crime" then they would probably just slow the process down. Several of the people who tried out my game told me that the sheer scope of it was insane, especially for 1 person. Granted, I worked for some 50 out of 72 hours, taking a day off.
- That said, if you have no experience with or don't like a certain area of game design, then team up. But make sure there is no overlap. Meaning, don't have two people working on art because it will not look good, no matter how each part looks. Same with code. You don't want to find yourself debugging someone else's code a few hours before the end of a jam.
- About scoping "small", I think that it's bad because it is not very challenging. If you are not challenged, you do not learn, so I always aim for the stars during game jams. Even if it ends up too ambitious and doesn't go quite as planned, there is a lot of value in the challenge itself. So I would advise against scoping "small".
I don't feel like I've learned much during this jam, expect perhaps to make the game more easy... something I also should have learned from previous jams. I also learned something about the limitations of the visual style I went for, and I was very lucky to avoid a massive problem easy on thanks to a small feature of the editor I was using, a problem that could have easily made me not finish half of what I got a chance to complete.
So in conclusion, sometimes working alone is the best during a short timeframe - you are the final authority on your game and you don't have to spend time discussing ideas with people and discard potentially good ideas you come up with because your team doesn't like them.
Cheers everyone and good luck :D