My first thought when I started this game was "ayyyy this brings me back to Pokemon Crystal!"
I enjoyed the story, I could feel the emotions in the characters as the tension rises up to the climactic battle. The ending was really bittersweet, I even teared up a bit.
The battle system is also engaging, having prefixes and suffixes to make many different combination of attacks is quite original. Although, for a game with infected humans as the enemies, I think having them roam around the map gives them a more threatening feel and increases the stakes of the story.
Overall, really great entry.