Hello,
The mac version seems to be broken as of trying 06.05.25 :'(. Won't launch.
Anyhow - you are amazing for creating this! I don't know why this game is not right up there with Super Mario Bros. , Duck Hunt, Megaman, Tetris etc. Because it's one of the most addicting, adrenaline & even strategic co-ops.
Thank you for keeping it thriving!