I do actually know a few tricks and I do consider myself decent at the game. Here are the few tricks I know.
Turn when followedIf you've got those pesky ghosts right on your tail, start turning as many times as you can. The ghosts tend to slow down when they turn while you do not. It can really save you.
Study the movementsEach ghost has a predetermined path that they will take. Play a few games and study them carefully so you can plan the safest possible route when you're ready to take them on for real, and in quite a few cases, avoid getting trapped.
Never pass up a multiplier chanceWhether or not you're going for a high score, it's important to get as many of them as close as possible to you before grabbing that flashing pellet. Once you get the flashing pellet, the ghosts will go backwards of their predetermined path. Use that to your advantage to get as many as possible before time runs out and you have to start fleeing again. Gobbling up as many of them as possible will make it a lot safer.
Every version of Pac-man rests on these three principles. Use them to your every advantage to conquer the game. I have yet to do that in the original version. Farthest I've gotten in that is Level 1F. (Level 31. The game's levels follow the Hexadecimal format.)
As for this Google Version, they got me at Level 6.

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