Companions: Most disappointing thing for me. Your are restricted to the three known companions from the prequel: Naurim (dwarf), Takate (indigenous forest-man) and Zurbaran (human). While it's disappointing that you don't get to know more characters, the bigger problem for me is that having these 3 companions only narrows down the character building options for the main char (Cassia), when you want to cover all possible "archetypes" and especially when you want to build the companions according to their native concept. Naurim is the typical melee tank. Takate is more a dex fighter with a spear (dual whield blades would also fit). Zurbaran is a typical mage. While you could easily make anyone of them a ranged fighter, that just wouldn't fit their personality. You even could skill Zurbaran into a melee fighter but as he's the only one of the trio being able to cast magic, you'll lack a full mage. So if you stay true to their native concept and want to have a ranged fighter it more or less is a must to skill Cassia appropriately. And you should skill her magic a little as well (which even is advised in the manual), for having a (second) supporter for healing/buffing. So with these premieses, her building concept sadly is quite predefined.
Daedalic could have solved this problem partially by adding a new companion. Best fit would have been a female elf archer: closes the gap of a lacking female companion, the lack of an elven companion and the gap of a ranged fighter companion. Perfect fit would have been
Niam - but unfortunately they decided for her to get killed in the prequel.