Well, I'm delighted that you asked!
As you can see, the icon depicts a Space Invader being shot at by a lone cannon. However, the cannon's projectiles cannot hit the Invader because of the "NOSTALGIA" label in the way. The enemies in Space Invaders have become much more iconic than the protagonist (the cannon), and they have become symbols of the game. As such, the pilot (?) of the cannon cannot kill the Invader because doing so would mar his childhood memories of playing Space Invaders. The "Curse your cunning!" caption should be obvious.