Last month I worked on a game with Jorge Fuentes, which we called Zoi. Starting from his idea about a triangle jumping on blocks coming towards it, we finished the HTML5 game in a week, using the Phaser library.
In the first weeks we had quite a lot of visits and feedback (specially from the north of Africa and Middle East, thanks to being featured in this website) and even ran a contest, daring players to get the furthest they could, recording the playthrough with a camera and uploading it to youtube. The winner won 30€ worth of GOG.com games. Was really fun :D
The fact is that the game was really addictive to many people and we thought it had a lot of potential, so I started to port it to iOS, which I did in another week's time, using Apple's SpriteKit. The game was published for free in the App Store some days later, featuring Game Center scoreboards, achievements and an in-app purchase to remove the ads.
But that is not the end of the story. A couple of weeks later, GameSys contacted us, and after some emails and talks, they bought Zoi, both the actual game and the intellectual property. So that is why you will not find Zoi online or in the App Store now :)