I would propose that there’s no theological reason to assume that we Humans on this earth are the only sentient beings which God has created within this universe.
If there are “Parallel Universes” or “parallel dimensions” within creation then I would similarly assume the same.
I would note however, from my understanding, that the “Angels” are not creatures of this physical universe, but beings which live with God in “Heaven” which is outside this physical “universe” / or “space-time continuum.” just as our Soul’s will continue to exist in Heaven or Hell after the end of time. (note time as we know it is a parameter… a dimension within our created universe, and closely ties to the 3 other physical dimensions. (or 7 other dimensions if you are a particle physicist… but we are unable to experience those dimensions the way God made us)