 If you liked
Muv-Luv Alternative: Total Eclipse
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 ...then you might like
Senki Zesshou Symphogear
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Both series faces off against an alien race that threatens humans lives with two female protagonists fighting against them. (SCI-FI)
Total Eclipse has the Tactical Surface Fighters to stop the BETA, and Senki Zesshou Symphogear has the Symphogear to stop the Noise.
Senki Z also has a great soundtrack and the two protagonists for both series are fated to fight with each other.