Ender’s Game is the rare kind of science fiction where character development is more intriguing than interstellar space battle. Based on the award-winning novel by the controversial author Orson Scott Card, writer/director Gavin Hood’s adaptation stays true to the source material, even if it trims some important details. Still, the core story about a young genius’ ascent from outsider to military commander is still intact, and Hood hits all the right emotional beats. It is no small task since the limits of the medium force Hood and his cast to find other ways to show what, precisely, Ender is thinking. During the crucial final minutes, it’s as if external forces constrain Hood’s vision. The ambition is there, but perhaps the resources are not.