Only tips I have to offer are:
- when you circle the sections that contain a pitchfork thingy, don't bother trying to chase down the enemies to get points. Just use that time to clear as much of the board as possible
- try not to "waste" your pitchforks by circling one while you are already invincible. If you space them out just right, you should be able to clear most of the screen freely while invincible
- there is no need to complete individual screens before moving on. If you get in trouble, just retreat to one of the other mazes and come back later