I made a quick html5 game for browser/phone/tablet which I think is nice and a bit addictive.
In SheepKeeper, you're a shepherd and you have to keep your sheeps at their place. For that you have to click on them when they go too far, to make them turn back.
There are more and more sheeps as time pass, and you need to keep up the longest possible.
I like this project and I'd like to make more like this one: Quick and simple games yet a bit addictive, working everywhere, and that don't require much assets (so very fast to load)