A scientist is not God. A scientist works with what’s around him. God creates without needing to create from anything. Furthermore, God Himself is pure, unconditioned existence. All beings that exist conditionally only exist by participation in what God is,at each and every moment. When a scientist creates, he creates something independent of himself. When God creates, everything that exists is entirely dependent at all times for their existence upon God. Anything that exists is but a steward of that existence. It ultimately belongs to God. This isn’t simply a legality, it’s a metaphysical truth. If God retracts what He was giving, that is perfectly within His rights. Not because of might, not because of arbitrary legality, but because it is truly His. There’s no comparison between the ethics of a human “creator” and God. The human creator will never be the foundation upon which all existence (or even his own creation) has total ontological dependence on by participation in His own act of existence which is indistinguishable from his essence. A question which more closely mirrors the reality is about whether an author is morally required to deal with the imaginary characters in his head ethically, but even that’s not perfect.
Personally, like many, I don’t subscribe to “Divine Command Theory” (things are good because God says they are), and neither do I believe that the good exists in some Platonic realm of forms whether God’s there or not. I (and many) favor natural law based on essences, and say that the foundation of human morality is based on actions/choices that bring us closer to manifesting the ideal of human nature in ourselves. We are human, so what is morally good for us is to behave like humans should, to be more fully human. What it means to be a good human is not the same as being a good dog or a good rose bush or a good hydrogen atom, and to be good in general is to be what you are. And being God is like none of these things whatsoever.