there are many things wrong with this fanfic.
the obvious nerf. if you think about it, there are many people that can kill a Viltrumite in Marvel. even the sorcerer supreme can do it in less than 3 seconds. or perhaps send him into the mirror dimension. the whole power issue seems like the author wanted him "work hard on gaining power". this is something we have seen done multiple times in countless other stories.
the relationship with Aunt May... okay, this is a personal one. I do not like it. I feel like you wanted him to get involved with peter somehow by all means. I can't even count the number of fics that do that. they always either want the main character to be a mentor or his best friend I guess here the author is going for "Daddy". like if that really means something to us readers.
The pacing. I actually do encourage you guys to read it to better understand.