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I've completed everything. The first mission is too easy. More than half of it is done by the ally, and it's also impossible to assemble the Angel alliance because of him.
The second map is also very easy and the longest in this series. Anyone can simply accumulate troops. Also, it's not fully developed: if you kill the Azure Dragons near the city, their hero appears. If you move away, he will come out, and you can take the castle without a fight. And there's no need to gather the Angel alliance; only guarding troops will spoil things, and there's little benefit left.
In the third map, the Colony has a Rainbow! This means you don't need to destroy the guards. You should have put more units in their castles from the very beginning.
The fourth map is also easily completed using spells.
The fifth map is interesting. I don't have much more to say, although there's not enough time, but it's interesting to explore.
All the maps are very interesting; thank you! It would just be better to make them a little more challenging, as they are easily completed even on the hardest difficulty.