Piece of Mind

In this game, the main character discovers that they have been paralyzed unless someone (the player) types them commands; they have become a sort of puppet.

The game explores the interaction between player and PC, while a mysterious voice gives dark quotes in the background.

The game is very descriptive and the writing is good, but eventually holes start showing up, and the puzzles can be very unintuitive and frustrating.

David Welbourn has an excellent walkthrough for this game.