Like you have any idea what God would've done either.
Once you go outside of the Bible, it's mere speculation. I just think, in light of all that the Bible says (and I believe the Bible is truth), the chance that God created beings on other planets is highly unlikely. Because the major theme of the Bible is God's love for, and redemption of,
mankind. Everything in the Bible centers on the relationship between God and man. And Revelation talks about a new heaven and a new earth, after the old ones are done away with, and in these descriptions I find no reference whatsoever to any other beings or planets. If such beings or planets existed, you would think God would make mention of them when He destroys and recreates everything, because they would be impacted too. So I think my conclusion is more valid, at least from a Christian standpoint.