I never got why people didn't like the animation
When people first complained about the animation, I thought that they meant how you could kind of see the frames. But I've checked out a few other anime releasing this season, and I don't really see anywhere that it's any better.
I think it was a really nice touch to have the >!Downsizing Game start with a bunch of wind and crap going on. The Minority Game started with it being nice and sunny outside, but now the weather is awful, and menacing, mirroring how this Game is gonna be tougher than the previous, without Akiyama and taking place in a broken down bowling alley with no food or water in sight.!<
I honestly don't know how I would improve on this Anime other than very minor things. I love how the people behind it very clearly. Read the manga carefully and are trying to do every part right.