For a gamer, this is a totally relatable premise lol
Here are my thoughts:
the camera move speed could be faster, or like LOL, move screen when your cursor is in the edge of the screen(though this sounds like a pain in the ass to code)
It's a great choice to pick the support class. I think you can add skills that manipulate enemies or teammates, in terms of position or other things that have instant feedback. Healing like what you did do provide such effect. First ability on the other hand, I could not understand its functions, maybe adding damage numbers would make the feedback stronger.
The main appeal can be the challenge in timing your abilities to sync with the assault of your teammates.
All in all, potential game. I guess with longer jam time, it could be more polished.