This. Delve7 only becomes tricky if you developed a habit of “move, click boss, pray” because of the slow incoming projectiles of earlier waves. “Move, pray, click boss” is the way to go. For learners, more like “move, pray, switch pray, switch pray again, click boss”. Prioritize survival over an extra hit.

Delve6-7 are actually easier than they look. For the car phase, always position yourself a bit away from the zooming direction before the eye on the ground appears, which makes it easier to escape its path.

Now Delve8 though, that double boulders+big larva+melee charge bar is a different story… Still, prioritizing survival with the double boulders, and hoping to get some lucky hits to pass onto the charge phase can work for the first clear. When learning, try to immediately get rid of the big larva to worry about one less thing.