If you were to try to explain games both as an artform and an industry, I'd start here. Within it, you could teach about how to adapt to a platform's strengths, what a gameplay loop is, using pixel art as reference and what it's referencing, labor, how to handle backlash, derivative design practices, archival efforts, and also the futility of the entire enterprise. It is the least offensive morsel of video game that generated the most vitriolic response possible, and deserves study. Genuinely, the game of its decade, for all stories about that decade in the industry run through Flappy Bird at some point.