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3623 total - 1377 upng.c (3rd-party tiny PNG image decoding library) = 2246

To be fair, Android itself requires some level of fluff.

So does making the game work well in more than one device.

Are you including SFML loc in that total?

game.c is 800 odd lines. There are some optimizations you could do here and there (e.g load digit sprites in an array to avoid the switch case 1/2/3... stuff).

The bulk of the 3000 is fluff that you need because this is C on Android, not SFML.