If you want to go fast, it helps to control your height. You can do this by aiming low on your initial swing. After this first hit, whenever you bounce off the ground or hit the geek with a power hit, hold backwards to slow him down. Don't worry, this is only a temporary slow down so that you hit as few bees as possible. as soon as you hit the top of your arch, speed back up again. you will return to the original speed you were at before you slowed down. This will increase the number of bees you hit when you are on your way down, making it easier for another "power hit" and also increases the chance of hitting a power up on the ground. If you are going to use this strategy, it helps to have items equipped that will either increase the number of power hits you have, or will increase the number of power ups on the ground.
Normally the problem I have with this type of game is that if you go to fast, you tend to fly through power ups instead of hitting them. You have managed to eliminate that problem it seems. I am glad.
I've beaten the game, and I'm still not sure what that last stat under each units name is. I know the heart is health, the bullet is damage, but what are those 3 bars?
Judging by the distance apart the gray circles are trailing behind the rocket, the rocket goes faster when it's positioned vertically than when it's positioned horizontally.