Thank you for you kind words, Dillup and Bartosz! You're right, some sound effects would be nice.
Does it work OK on Windows? Hold down 'I' on the start screen to see an FPS counter. I've tried a few machines: Ubuntu laptop: 85 fps iMac: 30 fps (!!!! terrible) Raspberry-pi 2: 17 fps r-pi 2 with pypy and pygame_cffi: 5 fps r-pi 2 with cpython and pygame_cffi: 1 fps I suppose the pygame_cffi call overhead is too high for pypy to be worthwhile in this case, sadly. John
