I've only seen a few Season 1 episodes of Evangelion and I'm not surprised why it would take more than blob-stacking to cheer him up. He'll probably have to play gigantic puyo puyo matches in his mech while his father berates him on his stacking skills.
Puyo puyo is a stressful game indeed, no wonder Shinji isn't happy.
Still if having a giant robot to pilot and variety type of girls to be friend with couldn't cheer him up, nothing ever will.