to beat the last level you need your last bullet when you encounter the clone, jump up and shoot the bullet this will pause yourself in midair but the clone will keep going making it so the clone doesnt mirror you anymore, work with this and you can get the clone to fall to his death
extremely fun, i find it difficult because it tends to lag when you get and lose power-ups, even more than the given time to allow you to move the paddle, but once you get triple score and your multiplier is above 50 your good to go for a while