Sonic Frontiers is the most disappointing thing since my son.
Just kidding. But I did just beat it, and I'm left feeling empty inside. This game focuses too much on being mysterious and cool that it ends up lacking any real substance. It's vague and doesn't entirely make sense, unless I missed something.
At first I was happy when the game directly referenced Sonic Adventure, but then they just kept referencing other Sonic games and it just felt forced. Heck, all of the levels in the game are variations of Green Hill, Chemical Plant, and Angel Island. It feels too safe, which I get, but like. It's like Force Awakens, where Sonic Forces is the prequels, if that makes any sense. I dunno.
This game has some pretty good gameplay though. I can only hope for a follow up with a more interesting world and story. They got Ian Flynn to write this game, he's the current writer of the Sonic comics and I love his work, but here he doesn't really shine.