I had a lot of fun with this, and got stuck enough to check the walkthrough only once. It's a nearly pure-puzzle work, in which you play a soul moving towards the afterlife after a ceremonial Egyptian burial. The setting combines plausible historical detail with some surreal mechanisms and imagery; the writing at times feels a bit zarfian. The first few moves and environments are not actually the game's strongest and may feel somewhat underdeveloped, but the setting becomes more interesting later on.
The puzzles are neat set pieces, self-contained and linear; they are mostly not terribly hard. Early puzzles may seem almost *too* easy, but they teach needed techniques to solve the later ones, and should possibly be regarded as something of a tutorial.
There were one or two solutions that I thought could have been better clued or could have accommodated a larger range of vocabulary. Most are really rather elegantly imagined, however, and most suggest some kind of metaphorical or spiritual progression of the soul as well as the manipulation of physical objects.
I also noticed that there were some scenery objects that were unimplemented. However, when I played, Ka was undergoing some upgrades and polishing to make up for some remaining awkward bits, which may resolve my other objections.
Overall, Ka is an enjoyable lunchtime-sized puzzle fest with a coherent concept and some memorable details and imagery.