Looks like they watched some "SEGA HIRE THIS MAN!!" videos and decided to make a game in that style.

Jokes aside it's a very good game and very relaxing, very different from any previous sonic game so don't come with any expectations, be prepared for a different experience.

HOWEVER, if you're new to Sonic or platformers in general, I WOULD NOT recommend starting with Sonic Frontiers, it's very experimental and I wouldn't exactly call it a platformer, start with Sonic Adventure 1/2, Sonic Colors or Sonic Generations instead to get a feel for what a real platformer/sonic game feels like.

This specific style is probably a one-off that will never be explored again. Even though I really enjoyed it, it adds a "relaxing" element to these games that I never felt before.

Looks like they watched some "SEGA HIRE THIS MAN!!" videos and decided to make a game in that style. Jokes aside it's a very good game and very relaxing, very different from any previous sonic game so don't come with any expectations, be prepared for a different experience. HOWEVER, if you're new to Sonic or platformers in general, I WOULD NOT recommend starting with Sonic Frontiers, it's very experimental and I wouldn't exactly call it a platformer, start with Sonic Adventure 1/2, Sonic Colors or Sonic Generations instead to get a feel for what a real platformer/sonic game feels like. This specific style is probably a one-off that will never be explored again. Even though I really enjoyed it, it adds a "relaxing" element to these games that I never felt before.