Nah, I'm fine.
I'm simply too lazy, and I'm not even that good of a developer.
I'm not gonna participate anymore, but I would've used Gamemaker Studio
From my knowledge, Writing down ideas and the such are perfectly fine. I didn't create the rules so my answer may not be correct.
Nope - nothing that's being created specifically for the jam can be worked on until the clock starts.
Maybe... The person who won gets assets from like the top 3 or 4 games?
Also. What's the minimum length (as in time) of the games?
Does the 1st rule include art and/or basic mechanics?