I finished MHE and while it works on an individual basis with some rare misses, the overarching meta-narrative left me wanting.
The most egregious and out of place reddit bullshit was the girl super hacker being toted around by the hard-ass former military man turned therapist. It felt like filler fan service specifically curtailed for a reddit audience.
The ending itself felt off as if there was a rewrite because the author didn't like where MC was taking the story. The kid saves himself by using the magic of Satan to bring himself from the future? It even makes a parallel that he's his own personal Christ-like figure. It feels like a giant trap. The main MC never finishes grappling with the fact that because the devil exists, God should exist too so the only conclusion I can come to is that he's taken the route to worship himself which would be falling right into MHE's hands.
It's possible this is the whole point (MHE gets the maddest when kid MC starts praying to God which should be a clue that's what kid MC was supposed to do, rely on God. She also gets angry when he tries to summon his parents, the closest thing a child can conceive of as God and something outside himself. So instead he takes MHE up on her offer to alter reality to save himself.
If the ending was intentional in a "I'm a reddit athiest, I don't NEED God because fuck dad!" kind of way, than the story is fundamentally flawed, but I'm glad there's enough leeway that I'm not sure which way it leans.