A Meaningful Metric?

I'm toying with the idea of making the score at the end of the game more meaningful.

Currently it gives you a figure based on the completion of puzzles, the places within the game that have been visited, and so on. It's all to do with the things that you've done in the game.

I'm thinking whether there is a way to take the way you've played into account. How many wrong guesses, how long you paused between moves, and so on. Perhaps something that can take into account the hesitancy with which a game is played.

I've got some research to do :)