you are absolutely correct on the lack of character balancing. The original idea was given the fact that minion is faster and jumps higher, I was going to design the levels so that certain platform or enemies are only accessible or avoidable with minion's movement, and mage was only going to take part with their given void vision or gravity manipulation. But due to my schedule conflict late into the development, I wasn't able to make levels the way I wanted them, maybe I will carry out this game further more and make some interesting level designs.
Thank you for the feedback!