The orb is pretty funny.

WHY IS THAT GODFORSAKEN ORB BROKEN OML

The infamously buggy orbs at the start are bad enough — while you can hit the orbs consistently by not buffering, less experienced players may struggle to figure this out, and this really shouldn't have to be taken into account — but there's a part later in the level with some reasonably tight wave spam that could easily be another choke point in a level that I really don't think needs more.