I appreciate how open you guys are, and how much you encourage feedback. It's really refreshing and appreciated by your community!
I'm a person who enjoys dedicating time to a single character, built around a single theme. I'm pretty forgiving with game mechanics, enemy variety, and environments if the skills I'm using are compelling and fresh. I typically play a sorcerer, so most of my experience is with that class.
First, I'd love to see Lightning Blast get a buff. Though it's the first skill you get, as someone who loves the idea of a lightning-based caster, I feel that it falls far, far behind the other spells you get as you level, even with heavy investment. I often get frustrated when I unlock skills like Volcanic Orb which seem to be exponentially more powerful without any investment, while my lightning blast skill falls behind even when maxed out.
I'm also waiting for a cold-based caster to be more viable. Ice Barrage still doesn't have a skill tree for it, unfortunately. Glacier seems great, but I would love to see the animation/fx get a bit of an update.
As a mage, if I can build a solid "kit" around a single element or theme, I get excited about the character. A few skills are just falling behind, either on graphics, place in development, or in damage.