The camera needs (in my opinion) to be more sort of fixed to the craft, while i like the effect of the camera lagging behind when flying over small hills and such, but when flying to and from higher ground the craft disappears out of sight.
Perhaps if the camera height was sort of fixed to the crafts height, but didn't follow it unless the craft was entering the upper/lower bounds of the screen?
I agree whit Mr.Confuzed that the control feels awkward.
If it's a classic hovercraft is should turn quiet fast, velocity changes occur quiet slow and there would be no steering other than the change of direction of the forward force.
If it's just a 'hovering' craft, well i guess that a little faster steering wouldn't be too bad.
I also feel that the camera Should lag a little behind when turning, and then settling on the same direction as the craft, but that is just a feeling.
A sort of afterburner a la terminal velocity style would add a lot of fun, especially since it would make turning somewhat easier, well it would feel like it was easier anyway
A jump ability would also be quiet nice, if for nothing else just to be able to use the afterburner, head towards a mountain and jump, just to see the craft flying of towards the sky