It's certainly a Sonic game alright, this game is the definition of good blueprint but not really a good game aka the first game syndrome. Green Hill is a great introduction to the game, but then it really falls off afterwards. Marble being eh, Labyrinth being egregious, Spring Yard was okay, Star Light was amazing, and I guess I found Scrap Brain passable? The bosses were also just okay. Overall, the game is a 6/10 but it's still worth playing at least once because you can easily beat the game in a single sitting. (Played the Sonic Forever version with infinite lives)