I like bullet hells, but I struggled in this one because of the movement speed of the character. Would be cool to have a some variation in the speed, like slowing down the character when pressing a certain key, this is a mechanic seen in some games of the genre. That would help, because I often found myself bumping in some bullets by mistake when resuming my movement.
Also, better feedback when hurt would help, maybe have Chronos turn red for a second !
Besides that, really great idea, visuals and sounds. :)