yes, i did max out the upgrade tree
and no, i did not even get close enough in the process for it to feel remotely winnable
you have to constantly kill the small enemies and collect the orbs or else you die in 10 secs and
you also have to avoid both the boss and the trail or else you get one shotted, even if the trail is already fading it still one shots,
and a hard to see one-shot combined with extreme fast pace and precision demanded makes the boss fight feel very unfair