Do angels have Free Will like humans, or are they just automatons?
Yes, angels have free will like us. When Satan chose to stop obeying and worshipping God, and vaunted his own pride, that was a free choice, with the consequences that followed. One third of the angels chose to follow him. (See Rev. 12:4)
What sets apart angels from us is that we can be forgiven and restored, and they can’t. To follow God or not was a one-shot deal for angels, as far as we can tell. 1 Peter 1:12 says that angels “long to look into these things” (salvation and grace), which are not available to them.
Hope this helps.