We are already aware of other life forms in this universe than ourselves, animals and God. The Bible describes the existence and even names some angels for instance. These heavenly citizens appear to be smarter, more powerful and to operate in more dimensions than we are currently capable.
But Jesus did not die for angels. If they sin it seems that is it and they are doomed for all eternity. Redemption is as far as I know a gift given only to human beings.
Also the existence of life off world is at the moment pure speculation as the off world places we have explored are utterly devoid of life.
I wonder how much speculation about aliens actually has to do with the theory of evolution/ubiogenesis and the view that life can spontaneously arise from primeval soups. Given that noone has ever repeated the experiment maybe there is more to it than that!!! As far as the scriptures say we do not know any more than we have been told.
It may seem reasonable to say God is creative , creation is enormous so maybe God… but it remains pure speculation.