It's a fun, old school platformer with enough action and laughs to keep any player interested. The only flaw, as I see it, is that it's a bit too 'cutesy' for older players, and the difficulty is a little steep for young players.
Still, if you're like me and find the cuteness hilarious (there's even a 'hug' button), then you'll enjoy this game.
Let me start off with stating that if you don't enjoy 2D side-scrolling puzzle platformers, this title is not for you. Also, if you're not mature enough to enjoy a game where you're not killing all the time, this game is not for you. If you're still reading, then this game is quite a gem.
Graphics are beautiful, reminding my of the look of Saturday morning cartoons I watched while I was a child. The controls work quite organically, and do not require the distracting waggle so many Wii games require. If I had to come up with any fault in the design of the game, it'd be that the game isn't episodic DLC (partially to allow more than the 4 areas) on my favorite console, but since I have a Wii, this is a shallow concern for me.
Some may say that this is a kid's game, but I don't know any "kids" who can deal with the higher difficulty levels here. Bosses are tough, and will take a bit to figure out how to beat some of them. Later levels will require quit a few platforming skills. Instead, you might call this a family game, one where the kids watch while mom and/or dad play. If you don't have kids (I don't), you'll still be able to enjoy everything, and probably more so, since you won't need to worry about putting the kids to bed.
Once I REALLY got into the story (it took me until the first level in the second area), all I could do was think of this game, and remember how magical childhood was. This game made me remember the idealized stories every mothers tells about how wonderful, innocent, explorative, and vivacious her child is, and how I was that child. I never was that child, but I felt the magic of being that child.
In my 30+ years of playing games, the only other game that I've played that has brought such an awesome sense of wonder has been Shadow of the Colossus. SotC was THE reason for owning a PS2, whereas A Boy and His Blob is THE reason for owning a Wii.
I always loved the old Boy and His Blob game even though I never could seemed to get very far mainly because it was different and creative. That much hasn't changed, but this game makes huge improvements with the graphics (obviously) and the game play.
You start off with little instruction on how to play, but after a few minutes you can figure out the buttons and what they do. It is a die from one mistake type of game, but the good news is, you have unlimited lives and you start right back where you died so you can try multiple ways to get past a roadblock.
You only get 3-6 beans each level limiting what you can try, but I think that is a good thing. Sometimes there are two ways past something, but most of the time it is just one. It does start off extremely easy, but gets progressively harder and the different beans keep the game fun and entertaining.
Whether you are a Boy and Hiss Blob fan or not, I'd rent this one for a couple days and try it out.