Like a tag team of oiled snakes that have entered a wrestling contest, theme is a difficult quality to pin down. A game can be well designed, but if it lacks a coherence between those mechanics and its appearance, narrative, and its framing, there is a dissonance that can be hard to ignore. I realise I’ve just stepped into an old argument by using the word ‘dissonance’, but Hocking was right, games that don’t cohere can be jarring. A developer…