Interesting game and great to see a Mac game too (having just bought a 2020 mac mini it was great to test a game on it!).
Game was a bit confusing at first and wondered where it fitted in with the theme, but after reading about the hydra in the description it starts to make sense, I actually thought at first the link was 2 bullets because after firing two bullets and missing the hydra twice the game goes back to the start.