It is World of Goo. I own it and love it, the game idea and environment are very nice, the physics engine makes the game truly interesting and trying to hit the

It is World of Goo. I own it and love it, the game idea and environment are very nice, the physics engine makes the game truly interesting and trying to hit the "OCD" bonuses, which are advanced goals like collect 21 goo balls or complete the level under a certain time, are challenging in a thoughtful way. You can try out the demo first to see if you like it, that's what I'd recommend. It's available on steam as well.