I was avoiding this game for a long time, thinking of it as a "kids' game," until I recently read someone's very positive opinion on reddit and decided to give it a shot. Now, I'm very glad I did. In terms of point-and-click adventure game design, Toonstruck is close to perfection—really top-notch. Except for a few slightly random ones (or maybe I missed the hints), puzzles are extremely clever and well done. They're not frustrating and not too easy, but hard enough to provide satisfaction. In two words: just right. Objectives are usually pretty clear, but how to achieve them might be tricky. However, when you deduce the solution, you'll be amazed at how cool and clever it is. Puzzles are logical, but occasionally may require thinking in a cartoon world's logical way. And the game's world is packed with those puzzles at almost every step.
It looks silly and like a game for kids, but the more you play, the more you realize it really isn't the case—at least not entirely. There is enough intelligent, absurd, and occasionally even dark humor to please adult audiences. Hell, there are even sexual or quite disturbing undertones (the infamous sheep and cow leather couple in their S&M dungeon... I mean, barn, would be the most peculiar one).
Heavily recommended for anyone who likes point-and-clicks with great puzzles, lots of humor, and is open to some cartoonish silliness.
A solid level of English proficiency is advisable, though, as the final puzzle of the first act is based on English idioms. I don't know how it was resolved in translated versions to make any sense.