So basically this is a puzzle game where you generally build structures of goo balls(some are blocks) which usually connect to each other. There are a few levels where goo balls stand on top of each other.There are different kinds of balls or species as the game calls them. Some burn, some are fire resistant some reusable some fill with air to float etc. The challenges are to stay off dangerous objects and areas like spikes and blades. A few levels has a strong flow of air. All in all very nice to solve and play.
Although one can ignore the story I suggest you don't so , the story is portrayed very well and the game has excellent music. If you every get frustrated with any game you should just take a break and play WOG. It was my remedy to forget all the anger and hate generated by other games.
I shall give it 5/5 ;)
Here is a small video I recorded :)