I like the presentation, but either there isn't much strategy to it, or I suck at card games. I suspect more the latter than the former.
Also, the linearity of it means some potential is wasted; you could go off the beaten path to get some restorative items, say; or get items/weapons from defeating enemies. Incidentally, there was nothing to stop me walking straight past everyone except the first enemy, which is a good thing, as I'd never have made it to the final boss otherwise.