I agree they’re most likely fallen angels.
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Just because we don’t know what they are, why assume they’re evil? If God created the Earth and the Heavens then he crested these beings too, if they’re from another world.
In Revelation you’ve kinda got your two witnesses on one side and those believing some other thing on the other ... so do you see “aliens” as more likely to be proclaiming the Gospel or playing a part in some grand lie being promulgated by the dragon, beast and false prophet (and the unclean spirits that resembled frogs that come forth from them, which stereotypical grays kinda do look a bit like with their large eyes, minimal if any nose, etc)?