If you liked
Soukyuu no Fafner: Dead Aggressor
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...then you might like
Heroic Age
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Both by the same studio and feature an opening theme by Angela. Both are shows featuring a combination of mechas and creatures. Both are on the losing end of a war with futuristic technology. Fafner is the more serious of the two with a much sadder storyline although you can emphathise with Age more in Heroic Age.