Now that I finally have time to reply....
You are right in that Genesis lists only 1 rule Adam and Eve had to follow and the consequences of breaking it. As stated, the Bible is written from the human point of view, so it's not necessary for us to know what rules angels live by. In regards Adam and Eve, there wasn't much they could do in the way of breaking God's laws. There was no one they could commit adultery with. There was nothing to steal. Etc...
There is no reason, however, to conclude Satan didn't have laws and rules he should have followed. Jehovah our God is one Jehovah. His ways and principles do not change and are timeless. Yes, sometimes laws change, but principles never change. One of Jehovah's principles is to be honest in all things. Another is to not seduce others into sin.
So, regardless whether Adam and/or Eve remained faithful, the moment Satan lied he committed a sin. Jesus condemnation was in context of Satan's lie.
(John 8:44) When he speaks the lie, he speaks according to his own disposition, because he is a liar and the father of the lie.
*** it-2 “Satan” par. 6 Satan ***
Issue of Sovereignty Raised. When Satan approached Eve (through the speech of the serpent), he actually challenged the rightfulness and righteousness of Jehovah’s sovereignty. He intimated that God was unrightfully withholding something from the woman; he also declared that God was a liar in saying that she would die if she ate the forbidden fruit. Additionally, Satan made her believe she would be free and independent of God, becoming like God.
https://www.jw.org/finder?wtlocale=E&docid=1200003845&srctype=wol&srcid=share&par=7
Regardless whether Eve believed Satan or not, the lie and challenge to Jehovah’s sovereignty was made. Satan's mere raising the question challenged Jehovah's right to rule.
Challenging Jehovah is a sin, wouldn't you agree? Would there need to be a rule in the scriptures before we conclude this is a sin?
(1 John 3:4) 4 Everyone who practices sin is also practicing lawlessness, and sin is lawlessness.
Sin is lawlessness. Challenging Jehovah's authority is the epitome of lawlessness.
The scriptures in Genesis do not list what laws, rules, or principles spirit creatures live under. Based on our ability to reason on the scriptures, however, we know they have regulations and that Satan sinned when he opened his mouth to utter the first lie.