Woaaah this is a very unique combat mechanic :D The Ui looks AMAZING o.o
For me personally I felt like Didi and Reina are weaker than the others, but maybe I just didn't quite understand how to play them correctly. Ash's LMB was straight forward, but with other attacks I felt like I didn't really knew if I or the enemy succeded with the attacks or not. So sometimes somebody (me or the enemy) died and I wasn't really sure why. Maybe some visuell feedback on the attacks outcomes would be helpful :) Also the ability explanations are a bit short/hard to understand sometimes. I could imagine something similar like in lol where you have character screen and a short video of the ability to actually see what is happening during the ability.
The brawl mode is suuuuuper helpful to learn the skills of the different characters :D