Compared to a lot of the strip poker/blackjack out there, this one is actually a nice idea. A little plain in some ways, but it works.
Shizuka actually picking what clothes comes off the player is actually pretty nice in a way. But it's a bit lacking in the dialogue department. It's nice she has some dialogue as she's losing, and if she's winning to a point - but I feel there should probably be dialogue whenever she gets the player to certain threshold.
I would think she should at least get dialogue when she makes the player take off something big, like their underwear.
I'm not sure how different things would be in the full version over this trial version though.