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Completed it. So, after Demonis, the game started to decline, which is a shame. The Labyrinth was still decent, adding some variety to the gameplay. But Murrok didn't really appeal to me. There are no quests, the landscape isn't particularly beautiful, and I spent almost the entire time on auto-battle. However, the orcs still have a unique feature – that orcish mechanism with plasma engines and mechanical traction. It seems the developers really went all out when creating it. Later, I somehow lost track of eight quests. Although I can already remember some of the ones I missed: the initial mage trial quest, the battle with the doppelganger, and the obelisks, which I found, but I just forgot to go and open the door.
Finally, the story was revealed, and after talking to the shaman at the end, everything became clear.
Yes, regarding the optimization of the games, both the first part and the expansion pack worked perfectly for me. Honestly, I'd like to see more of that kind of "sloppy" work.