A friend of mine used to run a Pocketmod Game community on Facebook for a few years. He created a few Pocketmod games in that time. He's planning to submit a manifesto soon.
I've been working on my own mini-games lately and while it's tempting to branch out into the other formats you've described, I'm trying to stick to tri-folds at the moment.
Still, it's nice to see someone working in this kind of area.