Nor was I aware of the game until I read some of the reviews, though I have to wonder if many of the performers who are also producers are fans of the game?
Just as a tale, it comes over as a cross between "Lost" and the Jules Verne classic "Journey to the center of the Earth" (choose your own favorite version of that one ! ), adding in the sub plots of how each character died to get to this clone of the "Savage Land" from Marvel comics.
As an animated adventure, it's reasonably well told, enjoyable to watch, a little gruesome from the violence level, though there's some predictability to the plot.
There's sure to be plenty of hate for the choice of a female protagonist and standard 'older white male' antagonist, ignore it, these characters could be any gender or colour skin and still work.
There's the odd line of fan service in-joke dialog too.
Overall I think the 7 to 8 out of 10 rating is well earned (the 1's and 10's are clearly the outlier scores that don't match the curve. Haters gonna Hate, and all that stuff.
It'd be nice if there's a season 2 in the works, and not just the teaser.
If you liked any of the programs or stories that this references, you'll probably enjoy this one too.
