Once you figure out how the CPU-controlled actions work, it's actually not all that hard to beat the game. (Although it's still incredibly luck-dependent.) I probably had the hardest time beating Stage 4, but after that, it was a breeze to clear the remaining eight.
You can easily manipulate the computer opponent's actions to get them to attack where you want, but only if you understand three little quirks about the game's programming. I could share them... but I imagine it's more rewarding to try and figure it out for yourself.