I will only add a small spoonful of something not so sweet to this barrel of honey.
1. I think it's unnecessary to force the main character to use Death Magic. I got tired of cleaning up piles of undead after each battle. They are of no combat use and only spoil the mood.
2. As mentioned above, there are problems with allies. For example, in the third mission, an allied unit stood motionless near the Gates next to the starting city for about 40 turns. Luckily, I already had a shipyard, so I sailed over by water.
3. I assume the last ambush was intended to be fatal, but I managed to survive. This, by the way, is easier than the fight with Lucifer. The plot feels a little weak as a result.