They failed to adapt the most important mechanics from the source (VN game) and thus ruined the finale. You should probably ignore this series and play the VN. In short, you collect light balls in the game and in this way you can change the fate of the character (Tomoya). In this series, the story goes straight to the worst ending with almost no explanation about this issue, and only in the last episode does this mechanic come into play in a very stupid way. As a result, everything you watched and the emotions you felt until the finale are thrown away in one fell swoop.

At this point, I'm not sad, just angry af. I will not recommend anyone to watch this mental torture and I hope to forget about this mess as soon as possible.