One of the first things I noticed were the similarities to Pixar's WALL-E also released in 2008. In both stories, humanity leave Earth due to the inhospitable nature of the environment, and live in large highly controlled colonies in space. The controlling bodies in each story also restrict knowledge about the true condition of a revitalized Earth in order to retain their power and control over a captive population. Replace WALL-E and his gang of freedom fighting robots with Takeru and his gang of boys and the plots are very similar.
But the ideas of humanity losing controls of their freedoms as technology advances toward a big brother state is also a common theme not only in Katsuhiro Otomo's earlier works of Akira and Steam Boy. Bosozoku (暴走族) inspired groups of youth fighting against the oppressive overbearing authorities who are abusing technological advances. Shuhei Morita's directorial debut with Kakurenbo also features a group of children rebelling against their lose of freedoms in an increasing dystopian future Tokyo.
Those of you are fans of Otomo's work should definitely check out Shuhei Morita as well, who I'm sure we'll be seeing a lot more from in the future.