It feels like the single-player for this was kind of last minute. It looks like 2 player, but with the computer controlling the other player. Since the AI always fires the same way each time (per level) and you only get one shot, it just means it's target aiming with a timer and is slow to go to the next attempt when you miss.
I also found the aiming to be rather precise. I wonder if playing on a controller with a keyed analog stick (like the GameCube controller) would result in this game being easier.