There's a bug where Evil Neuro doesn't move whatsoever. Only been able to progress by glitching out the game. By pushing the mirror at the same moment as spawning Evil Neuro, you create a sort of phantom Evil that's visible but intangible. Once the phantom is created, Evil Neuro can be created with the mirror as it's supposed to and mirror your movements. It only works if you have only te Mirror artifact, and once the phantom is created, Evil Neuro will function until you next reset (either manually or by death). Super finicky and annoying to do, but it's a temporary solution for those also suffering the bug.
Phantom Evil Neuro: