As a kid, I grew up on the original series. We were hmm 10 years old kids, and everytime after the episode, we were playing football. Well, we played football all the time, but still ;)
What I want to say is that, you did a great job here :) Sure, it's nostalgia too, but at the same time, you ... improved the original one.
- the voice acting is great
- the animation itself is beautiful
- you smartly cut out the waaay too long scenes of the original, so it now fits more to the current times :)
- you introduced a lot of characters very nicely, it's like there is a story behind them, they have more depth
I would say it's one of the most underrated series. It beautiful, it's about having dreams, having good sport values (respect for the opponent etc.), and it's really exciting seeing all these new opponents where each one brings something new on the table :)
As a grown man now ;), I can truly say, that you made a lot of people (those who know the original series) very happy making this series again. You didn't break anything, and you did all improvements / changes very nicely :)
I also, kind of teleported to me having 10 years old ;)