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Still, 3 lizard units is too much. Maybe it would be better to remove the lizard warriors and replace them with snakes (or something else)? Having lizards on 3 levels in a row is also quite absurd.
With the "humans," the peasant is drastically different from the swordsman, who is also different from the knight or monk. In the case of the lizards, this won't work because the archer and warrior are already too visually similar, and a caster (if they give him the same head) will completely ruin everything.