Wunderverse is not a game but an iPad adventure editor that lets you build your own stories. It comes with a few starter adventure chapters already written, though as far as I saw it didn’t look like any of them were finished stories. Of these, I completed the sample set in the paranormal world: a vaguely Sixth-Sense-y story that could have been more strongly written and that still had a couple of typos. But I have the feeling that the actual content is not what the app’s creators most care about; they’re looking at this primarily as a tool.
The good: the app looks pretty slick, and it features the ability to theme your stories and include sound effects and other elements.
Though it has a tap-only interface, the underlying world model feels more like parser IF than the models in most competing systems. You can create nodes and objects, and certain verbs remain available to the player at all times. The system also provides for player character stats and abilities, and for conversation. Nodes function sort of like rooms and sort of like narrative nodes, so you could take this either in a very map-based direction or in the direction of a more CYOA-style narrative. (Personally I feel a little bit itchy about conflating space and narrative state into the same thing, but I accept that it’s sometimes useful to do so.)
Emily Short's Interactive Storytelling 