A basic design complaint that negatively impacts gameplay: Too often game design hinders the dissemination of crucial player information. These are just two examples that happen frequently...
Problem: Just as Forest Lord is about to hit, a large tree blocks all our view. We cannot see if he criticals, or anything else about the hit because it is all blocked. Solution: Remove the tree or alter the camera pan to accommodate.
Problem: Depending on the enemy and the spell, I often can't even see how much damage I've just done because you've placed the target so high on the center of the screen in your framing, that the number actually begins off-screen.
Solution: Start the damage points number lower on the screen before having it drift up and fade out.
Another small issue is that if a wizard selects his spell card very early during the timer countdown, sometimes the wizard status stops showing their selected spell, confusing other people, is he/she hitting/healing/thinking/passing?.