This is an adorable game, in as much as it's not really a "game" per se. It's more of an interactive story that requires you do a bit of exploring before it will tell you the rest.
There are no enemies (kind of). There are no bosses, and really the only thing pushing you forwards is hearing more of the story. Or, if that isn't enough to go on, by finding all of the balloons.
The game is really disorientating at the beginning, because it's attempting to teach you how to use the paint mechanic in order to find your way around the world for a little bit. This is fine and dandy, but until they introduced shadows into the game in the second level, I had a hard time focusing. If you shoot too much paint, everything turns black and it becomes difficult to distinguish edges. If you don't shoot any paint, you can't find your way around (and there's a trophy for getting from the start of the game to halfway through the first level shooting only 3 paintballs. You'll notice that this is in the section that is completely fucking white.)
If you're the kind of gamer who likes to move from epic battle to epic battle, this definitely isn't the game for you. There are no enemies to speak of except for a couple spots where you can "die" because of baddies in the woods, but that part only lasts a few minutes. You won't be asked to throw paint at anyone in an attempt to knock them off a ledge, or to defeat them in any way. The purpose here is to tell a story. The entire game plays out like you're living in the imagination of an eight year old. You're tracking down the crazy king in a dream during your first night at an orphanage after your mom died. The story unfolds like a fairy tale -- "The King's new subjects were tired of white. They were tired of trippig, of banging their shins ... in response, the King pledged to spend the next month painting shadows for his kingdom." When something like that is told to you in a sweet, motherly voice, it's hard not to imagine being wrapped up in a blanket, tucked into bed, being read a story by your mother.
This really is a charming game that does what it can to keep itself interesting while you move through the story. There is a narrator who ties the four chapters together, and when you uncover the hidden pages of the story (marked on the landscape by an illuminated latter) you are given just a bit more of the story, and what Monroe is searching for. During your adventure, you will (thankfully) stop having to paint the landscape in order to find your way around, and will move onto through water balloons to direct vines, using your paintballs to move obstacles, and navigate through the pitch black forest in search of the king's castle. Eventually you will have to build your own landscape in some sort of 3D crafting world that interacts with "reality," but this is perhaps the most disjointing of all the scenarios, and one I didn't care for.
There are a few downsides to this game, and the main one for me was the fact that I wanted to find all of the hidden balloons in the game as I progressed. After you collect 3 balloons, you can turn on a sort of "balloon radar" thing which lights up as you get closer to another one of the collectibles. There are 64 in the game, and if you are actively hunting them it can turn the story from "boy explores his dreams and tries to make sense of life without mom" to "boy loses a bunch of balloons and tracks them down while defacing private property."
All in all, it's a great game if you're looking for something short and a bit non-traditional. The story moves you forward gently and never rushes you, it attempts to (and I think succeeds) try something different in a medium that has largely become stagnant and repetitive, and it's simple enough that I would feel comfortable putting anyone in front of this game knowing they would have a good time. The major downside is it's quite short -- I 100% completed the game in about 4 hours. I'm not sure if I would have been this satisfied with the game if I paid full retail price of $14.99