I honestly don't think this game is derivative because it falls on an anniversary (or was supposed to). It doesn't seem like a celebration of Sonic's history at all, I think the shoehorning of old stages is just a way to stretch out gameplay while also allowing the Cyberspace levels to not all be PSO2 cocoon-style environments that use the same "training room aesthetic" for every level. Also @Starduster, I literally could not possibly have said it better myself. That definitely summarizes the way it feels seeing "thank god the cyberspace levels are the real meat of the game", they're kind of equally present. On one hand, even if there are a whopping 30 action stages and they each took 4 minutes (hands-on impressions have said they usually took around 2 minutes, but let's be generous because you'll probably replay them a few times to earn keys), that's only 2 hours out of an allegedly 20 hour first playthrough. But on the other hand, even if you spend most time in the overworld, the action stages are a huge piece of the objective. You can't move onto the next island without them. And it seems like a lot of the skill grinding you do in the overworld will reward you with fasters times in the action stages. The fact that it's a gameplay loop and a mixture of different tasks is what makes me really excited for the game tbh. It's not just one thing or the other, which is awesome for my incredibly short attention span.