The important things to remember is that it's a very unconventional Pac-Man game, and also a very unconventional pinball game.
The ghosts make frequent, sudden 180-degree turns. This makes them very dangerous to be near, but also makes them a bit slower at crossing the maze. You have to play very slowly and cautiously, and make extensive use of the tunnels to bait/group them on one side of the screen, while you grab some dots on the other side. In other words, you can't approach it like other Pac-Man games where you can make long runs gobbling up lots of dots - you have to carefully chip away at the playfield while keeping a safe distance from the unpredictable ghosts.
The pinball table has some strange shot angles, mostly because it's very short, and the flippers are mounted at such an unusual angle. Trying to make a straight shot for the blue drop target has an extremely high chance of draining, so don't do it unless you've got a really good reason to risk it. Go for lots of cross-table shots, like the loops or the yellow drop targets above the opposite flipper.