It's the mother of all Indie games. http://steamcommunity.com/sharedfiles/filedetails/?id=313215979
Years ago there was this cool demo called "Tower of Goo" which I played for hours! It was directly an advert for this game. So I felt familar with the physics engine and the mainly game concept. You have to drag drops of goo which generate connections between them and lets you build up complex structures. These structures are flexible and react on the physics around them. http://steamcommunity.com/sharedfiles/filedetails/?id=313216017
You have to think a lot not to break down your structures and reach mostly above the tap. When it's done the tap changes to a kind of vacuum cleaner and sucks the rest of the goo drops into. Most challenging is after you finished a level to do it in OCD (Obsessive Completion Distinction) mode. http://steamcommunity.com/sharedfiles/filedetails/?id=314343308
That means to do it best and collect all max. possible goo drops. Which feels hard as playing golf and reach on every course an hole-in-one ...