I'm a fan of the whole impossible aspect of the games. No matter how hard you try, she's going to dominate you in the end. It's rare to find a good game like that. I suppose I'm just the target audience. :P I personally prefer the first game (the one with the maid) over the following two, though. I like that it's entirely first-person, as that's the most enjoyable part for me, and as someone else stated, the new girl's outfit doesn't leave much to the imagination. There's such a thing as too revealing.
I'll continue to follow the guy's blog. I'm interested in what other game modes he might put in. Maybe even multiple girls. That would easily be worth $10 for me.