Mushroom 11 is one of the more interesting games we've seen at the Game Developer Conference this year. The core of the game involves guiding a large fungal mass across treacherous stages by destroying parts of the fungus with touch, and allowing it to grow in the opposite direction. It's a truly unique mode of locomotion, and gets particularly interesting when you have to leave bits of fungus behind in one location so it can grow later as you destroy the rest of it.
As you can see, the gameplay mechanic is very polished, and the bulk of the work ahead for the game is simply a matter of building out levels and puzzles. That should take 6 - 9 months, and the developer, Untame, said that they're aiming for this to be a standard premium pricing structure without in-app purchases, though hadn't settled on a final price point just yet.