Some levels were fun, most were boring trial and error.
The good: The graphics and sounds and presentation are all nice, except for the internet stages. Its just ear-rape there. The style and wording are interesting and humorous. The well designed stages are entertaining, but easy. Got it for 5 bucks!
The bad: Its very short. There were about 2 hard stages, and they were only hard because there are luck based. You can build the same structure over and over and get completely different results each times because of the retarded sway mechanic the game has. No motivation to use your extra goo to build a mindless tall tower. Basically every level has you build the same thing over and over, with minor variations depending on what tool (balloons, bombs, ect) that you are given.
Finally, it was a decent game for 5 dollars. I feel bad for those who paid full price. Oh, and don't bother with OCD. There is only 1 way to do each and its not fun, it just isn't. Most of them require borderline exploits to accomplish, not very imaginative.