Lots to go through here! I appreciate the extensive feedback.
Ravager is definitely very strong right now, but that was intentional. I plan to make some balancing changes that bring the rest of the enemies closer to her level, and she was a first step towards more of a challenging game. This change will be gradual, however, so as to not upset the balance in an extreme way.
Lots of very cool enemy ideas here! While I don't want to give much away, I will say that some of your suggestions are very close to content that is already planned (for example, the Virtuoso is already going to be added as a bard-type enemy in the next couple of updates).
More party members are also coming. The next update is planned to add a new support party member, and the identity of this character has already been confirmed in game.
As always, thanks for such thorough feedback, and I hope that you have a fulfilling day as well.