If i could used one word to describe Invincible Fight Girl to someone it would be " Terrible ". We currently live in an age where animation is far more mainstream than even its live action counterpart (see the Japanese, Korean, Chinese and European industry).
In a show that took six years for this show to be made, while we don't know how much it cost to produce it. By the look of the animation we can all agree that the show clearly did not have the budget for the kind of story they wanted to make.
The show heavily barrow from Shonen anime (mainly dragon ball). To the point of re using sound effect from said show in the most rip-off way possible. Not including the frankly juvenile humour clashing and art style at times.
The " fights " if you can even call them that are simply put piss poor. Not a ounce of compositing or planning. The abused of reusing frames is battening obvious to the viewer, the " impact " of the blows are non existing, and the editing is so unbearable at time you would believed they simply gave up.
In term of " story " there is simply no logic or real any drive beside the most basic of basic " I want to become stronger and be the greatest wrestler alive " I can smell the Naruto influence a mile away.
All of this is made worst by the million of trope and simply torturous experience that is the voice acting, its overacted like one of those terrible dubbing of old action anime.
The show should have been made far shorter, around 5-10 or so minutes, giving us better quality fight and simply showed her rise as a wrestler.
I am not sure who the target audience is for this show is. Because i can tell you this, Shonen anime fan don't want this when they got good Shonen currently ongoing.
Animation fan don't want this because there are so many greater animated program already made such as Arcane. Adult wont want this because its simply far FAR FAR to childish with wrestling not being the most popular of subject around.
Simply put the show is terribly made and planned. I cannot for the will of me give it anything above a 2/10 at the very best. Anyone who gives it a rating higher than a 3 might as well be lying and spitting on your face and intelligence.
The best i can say to this, i'm sure toddlers would love this show.