- Fully 3D. I enjoyed the Genesis titles as much as the next guy, but after 21 years, it's time to move on, at least for the main series games. Sonic needs to dive head-on into 3D gameplay to really nail it.
- Bring back the spindash, and make it useful. I really liked the mechanics of the spindash in Sonic Adventure. Some people claim it's "broken," but I completely disagree. Let me explain: it's simple to use. Tap the B button for a quick spin, tap to exit the spin. Charge for a longer spin. Sure, if you tap the B button repeatedly, you'll speed through the level, but it's only useful to do that if you're actually good at the game, and can do it strategically to find shortcuts and blaze through longer sections of the level.
- No boosting. Sonic Rush and Rush Adventure were probably the only two games where boosting really felt appropriate. Leave it out of the 3D titles, so the player can focus on Sonic-style platforming action.
- Use of other buttons than B for actions. Need I say more?
- Get rid of the instant light-dash. Yes, you read that right. Having an instant light dash is often really glitchy and frustrating, especially if the button you use to do it is used for other actions as well. I liked how in the first Adventure game, you could charge up, walk around and jump, and then light dash whenever you needed to. And I can't recall a single time that I died because of a failed light speed dash in that game, as opposed to Adventure 2 and Heroes, where it got to be very frustrating. Also, I think it was really cool how (once you have the Ancient Light) the light speed dash targets enemies.
- Revamp the homing attack. There was a topic about this that I fully agreed with. Also, the idea of a spindash or ground-based homing attack would make things really interesting.
- Adventure Fields are good. I really enjoy the ability to just run around and discover things on the Adventure Fields in Sonic Adventure, whether it's a power-up (which were really cool, and I'd also like to see in future titles) or a transport to another Adventure Field, or the entrance to a level, or heck, even a hidden emblem, I think they would make any Sonic title a lot more fun.
- Beautiful levels. One of the things that attracts me most to any Sonic game is the appearance of the levels. I love a level that is unique, and really awe-inspiring to look at. We all know Sonic 06 was a terrible game, but Kingdom Valley for instance is a very pretty level. Future Sonic titles should focus on making the most beautiful levels possible, and a dash of realism always makes levels more enjoyable for me.
- A sense of adventure. This pertains partly to the story, and partly to the game as a whole. When I play a Sonic game, I want to feel like I'm exploring, discovering, and really embarking on an epic journey with depth and intrigue.
That's all I have to say for now. What do you guys think?