Other info same as above, but sometimes the Hard dungeons plain don't work. As in, you go to what should be the bossfight (or any fight, or try to complete area, or whatever) and the game locks up.
Third is that some of the skills don't work, for example the Knight's protect just hangs the game.
Would be nice to be able to customise your skills bar too, so you can have your own choice of fighting skills available in combat.
Strangely enough, sometimes you seem to NOT get that problem in the easy dungeons, so I don't know if it's only bought easy dungeons that do the strange thing with your first slave, or if it's only "not the bought ones" that do it. Regardless, I have completed some easy dungeons and not lost my first slave temporarily, and I have "taken prisoner" some characters and successfully gotten them at the end of some dungeons, so I don't know what is the determining factor to make it happen or not.
Honestly probably playing this demo rather more than you had intended but I'm quite happy with it so I'm not even done as YET.