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Super Mario Bros on the NES came in at 31 kB, and it was a bit more of a game. 100 kB for Flappy Bird isn’t all that impressive.
Having to support one type of device allows for a lot more optimisation than supporting thousands
Android has a massive built-in library of supporting functions that abstracts away most of the differences between devices, including support libraries for older versions of Android, and Flappy Bird is almost the “hello world” of gamws writing.