I finished the main game just now although there seems to be a chapter 8 so maybe Im not done? Plus theres the B side version of all the chapters which is probably really difficult. And theres an 8 bit game within the game so there is a bunch of content here. Took me 7 hours and change to complete the amount I did, which included collecting 113/175 strawberries. My death count was 937. Death count prob shoulda been a bit lower but I replayed a few of the early chapters to collect the Bside tapes that I missed the first time around.
Really recommend the game. Got more hours out of this than Sonic Mania and Im not done with it yet.