As a Portal player, I'm a bit more fond of the types of puzzles without searing laser fields and acid pits: I like to experiment freely without worrying about dying and having to start over. Many of the puzzles in Mel, however, are of the more fatal type, to be approached carefully and methodically. Gels, cubes, lasers, switches, turrets, and force fields are the main tools and obstacles you'll face in the sprawling and complex levels. Naturally, you'll engage in a showdown with a malignant A.I. near the end of the game.
As far as voice-over work goes, one actor provides a pretty good Cave Johnson impersonation, and another voices Virgil, the personality core who accompanies you through the majority of the game. I didn't find the humor particularly effective, and much of Virgil's dialogue feels like overkill as it's based around him encouraging you to find a way out of the facility. You'd be doing that anyway, right? At the very least, it's done with a lot of enthusiasm and an obvious fondness for the Portal series.
