hello Shidy!
Thank you so much for your detailed input!!
There is a boss in the game so the limitation is covered. For the theme the idea is as you progress you become bound to the light and you are unable to move freely in the dark, so you have to fight while you are bound in the light and dashing at the edge of it. It becomes more clear as you progress in the game.
But yes you got stuck at probably the hardest level. I included a gif how beating it the parkour/combo way, but there are other ways of doing it.