I like a few others had to register just to make my thoughts about this amazing demo known. It's mind blowing that a team of four created such a fun and potential filled game.
The great draw about Sonic was always watching him run, jump, and roll around the world like it was a playground as he darts through loops and up walls, kind of like Sonic CDs opening. For once a Sonic game allows the player to do all of that - Building speed more and more by using the momentum from the environment is so rewarding in Sonic Utopia, with practice of the level layout you can get Sonic running at exhilarating speed! It really feels like infinite possibilities, Sonic can run up any wall and earn speed in many flexible yet rewarding ways and with enough creativity. The rolling mechanic is implemented so well - It's rewarding to find hills and slopes to roll down, and well balanced because it must be used with awareness to keep the speed going. The homing attack is great as well, requiring environmental awareness and timing to make the most of it - and mastery of using enemies to bounce off to sling Sonic in that direction with all his current speed is another great spirit of the classic titles that lives in this game. I've yet to play another Sonic game official or otherwise that expands on game mechanics that made Sonic so great, and allows the player to feel the most connected to Sonic and the world. I only wish I could find this fellow's Patreon because it's well deserved now that I've played for over 70 hours.
Also for players having camera control issues when starting the game for the first time with a dualshock controller; the issue is easily fixed by going to the input tab before launching the game. The issue has to do with what is set as default for the "View Horizontal" and "View Vertical" inputs. Click to change view horizontal to "Joystick 1, Axis 2" (Press left or right on right analog stick) and click to change view vertical to "Joystick 1, Axis 5" (Press up or down on right analog stick.) Hope this helps!