I dunno what to say... Sonic Forces was such a short game that I don't think it took long enough for me to get full impressions.
But I do have a lot to say, considering that I beat the game in three sittings. And it's gonna be all over the place.
Modern 3D Sonic almost always have to have some sort of gimmick in this, this time, you have an avatar that's basically you in the game and you have very few powers compared to Sonic himself. This oddly enough is not as bad as say the Werehog gimmick in Sonic Unleashed. Design-wise, I do have a few things that leave me a bit iffy. If handholding in Sonic Generations was an issue, I daresay that Sonic Forces will make you want to blow your head off. Because it's not that they do everything to keep you from dying off in the game, the removal of lifes completely makes the challenge factor null and void. Initially it did annoy me, but after a while I did start to see some interesting upsides.
Visually, it's the best looking Sonic game in 3D I've ever played. Game stage design goes from great to so-so depending on which character you play as (Modern Sonic, Classic Sonic and Rookie Character). Oddly enough, Classic Sonic is the weakest, while he does have a few fun stages, I feel like his portion of the game feels like padding.
What else? The tone of the story goes from dramatic Final Fantasy-ish set pieces to goofy Saturday Morning Cartoon in the same cutscenes. Pretty weird. At the end of the day, it's actually a decent to good game. Nothing was bad enough to break the game. I was expecting a Sonic 2006 level of broken, but fortunately, it's nothing within that ballpark.