The first thing you notice about Unleashed is that it's very pretty. Even with rough shadows and unfinished lighting physics, the game looks gorgeous. It looks like it might also play quite nicely, depending on controls. There are two different styles of gameplay in Unleashed which, together, could satisfy most Sonic fans.
For a lot of people the name Sonic is synonymous with "speed," and the day-time missions in Unleashed reflect this. The first level seemed simple enough -- hold the analog stick in the right direction and watch Sonic go, making sure to jump in time. Obviously, this won't be true throughout the game, later levels will feature more precise platforming sections and less non-stop running. There are also different routes to take throughout the levels, which require a specific button combination press in order to reach.