>>22579
Yeah, I guess we could go through games with trivial mechanics as a start. Mentioned flappy bird, pong, Tetris, etc. It's easy for starters and if you have time left you could always spice your game. I'd rather go for 1 week timeframe.
It would be nice to keep theme/mechanics secret before the actual jam but announce jam beforehand. Main point of jams is having limited timeframe, deadlines help getting shit done or recognise that you won't make it. If the theme is known beforehand, it's easy to stretch the timeframe. If jam starts unannounced, people might not want to join in the middle.
Although the board is very slow so there might be no point in trying to do the jam that way.