The tutorials helped me out so much here. Knowing about the Left+Attack command with no delay at all is a gamechanger. I felt like I could master this if I spent enough time in it, really great job!
My only suggestion -- what if you put the "powerup" bar above the player at all times? I might just be dumb but my eyes are so focused on my player in the game i never really look on the upper left to see if I have ability. Just an idea.