How many levels did you survive? Just curious to find out how difficult the game appears to be to others. I shared this game with my colleagues, friends, and family last weekend. The maximum anyone has claimed to reach so far is level 10. The maximum I have been able to reach so far is level 8.
The player has autofire. No buttons need to be pressed. The player emits a green laser pulse automatically. As soon as one laser pulse disappears (either due to going off the canvas or due to hitting a ship or canon), the next laser pulse is emitted automatically.
For that reason, you may notice that the laser pulses appear more frequently while hitting low flying ships because it is quicker to hit a low flying ship than a high flying ship.