We had another meeting on the 5th of February to do more brainstorming (and have a good meal). The following games and libraries were mentioned, and are linked here after the jump. Eitan transcribed them and emailed them out, and Philip formatted it for the blog.
A game that allows the user to control the difficulty level that he experiences.
A game designed to promote relaxation (you can read more about it). Downloadable only.
Hell of Sand
A strange, addicting toolkit. May have trouble loading on some browsers.
We didn't talk about this, but I wanted to add it anyway. It's a bridge building construction set. Downloadable demo only. If you want, I can get you a copy of the full game.
Defend your Castle
A good example of how simple gameplay, executed nicely. Enjoy.
Rube Goldberg toolkit game. Downloadable only. I have not tried downloading it, so I can't speak the reliability/authenticity of the site.
I don't know of a pachinko game, but that doesn't mean one doesn't exist. I would suggest doing a search to see what's out there. You can search YouTube to see videos of the machines in real life. If anyone has ever been to the Pacific Science Center in Seattle, they have a big one downstairs (no betting involved, used only to demonstrate probability).
Here's a better video of the American version of pachinko, plinko
Open source physics library