It's not about rendering. At least not only. The other com8cs you mentioned is drawn with entirely different faces. In it the style is somewhere in the very nice middle ground between realistic and cartoony with a mix of both eastern and western stylisation.
Here though? Goofy the movie meets Gambling Apocalypse Kaiji.
Author tried to push their style more and more to the point, that it had just lost the structure of what made it look so good in the first place. Happens constantly with many artists. There are moments when the art is really great, but other times it's looking very unpleasant and uncanny valley- like it can't decide it wants to be Disney animated movie or old school manga.
I hope th author finds their way again, because the story is so good in this one.
everyone talking about the art style should read play time with hakdo (same author/artist) not only because its a really good story but also because i think its a good example of what this art style is rly meant to look like. i think the problem in this comic is that the rendering is too polished for the cartoonish style the faces are drawn in and it creates a disconnect between the face and the body of the characters. but in some panels u can see it working rly well and coming out beautifully. either way, this story is rly enjoyable so give it and the art a chance!!