Added 7 minutes later
I'll add separately about the units:
1. How manticores and wyverns are better than ifrits: they occupy two cells, which gives advantages in some situations (although sometimes it's the opposite).
2. Regarding nagas: retaliation is not such a useful skill, as in large battles it almost doesn't give anything. (Here's an example, even if it's fictional, but something similar always happens: a skeleton hits a naga, the naga deals damage, and then all the others hit the naga, and no one takes retaliation damage).
Added 1 minute later
And I'll add about cyclops:
one squad of cyclops does the same as a catapult. (And it doesn't matter how many there are (1 or 100)).