That’s quite impressive; it seems like it’s essentially two games in one! I was expecting it to be a quick 2-3 hour experience, but this is a pleasant surprise. Considering the pace at which the levels progress, I’m guessing this includes the standard bonus missions as well though?
As long as it exceeds the duration of the Project Shadow DLC for Sonic Forces, which is about 20-minutes over three levels, then it definitely sounds promising!