Tucked among a sea of indie gamers, Pokemon duels and Smash Bros. competitions, Griffon Schumacher was seated at an exhibitor table — empty but for an outward-facing tablet loaded with a game for passers-by to play — working on his homework. Schumacher was debuting a product he and three others created during a 72-hour video game-making competition that was part of this weekend’s DreamHack e-sports tournament.