Having sunk several hours (likely at least 40+) into the game now before I started my most recent save, I can now say that with just under 13 hours on the in-game time played (obtained by pressing T for those who might not know), I've managed to beat the main quest line.
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I tried taking down the final voss with my prefered team of my warrior character, Gwen and Alexia, but for one reason or another, it never seemed to work. Either the minions took me down before I could use a skill, or the final boss actually started using their own skills to make things frustrating. However, I discovered that poison was the way to go with this fight, using my warrior character, Simeon and Matthias. I poisoned the guards, then hit them again for good measure being careful not to use too many attacks that they could counter, all the while keeping the final boss unable to attack. Also, having large amounts of potions for stamina, mana and health is very useful if you don't have Alexia on your team. I reckon if I'd have had one of Alexia's latere skills the fight may have been easier but I don't think you get it until around level 30+.
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I'm going to try and clear up the side quests, though I'm still having trouble finding wolf dens and ambush sites. We'll see how that, plus the quests in the mines end up going.
Congratulations, once again, to the teams at Out Of Sight games who created a compelling narrative with, I'd argue, well-written characters (who are also voiced with talent by those who undertake the roles).
I look forward to seeing where this game and future projects from Out Of Sight Games go, given this strong entry into the RPG genre. With New Game Plus as an additional experience, it'll be interesting what happens once a player obtains all the skills. Who knows. It may be possible for a player to take down larger-scale enemies single-handledly, but that remains to be seen.
Regards,
Sightless Kombat.
***If you wish to refer to me in @replies, use Sightless***