Thanks very much! I'm glad you enjoyed it!
Elite enemies have a variant of the normal enemy behavior or attack. They're all a bit different and - I think - a bit harder, but that depends on the player I think!
As far as an in-game enemy guide/log book, I'd have to think about that, since it's a lot of information that I'd want to be presentable and not too cluttered. But I will look into something along those lines!