I don't like this level...
First thing I thought was that there's nothing happening: Yes, there's no enemies, but even so there should be more action. Things I would work on:
-increase the speed of the plane a lot or make the level much smaller. or fill the level. Atm, the level's so empty, and it seems you can just let your plane fly and not steer at all. There's should be more things you can crash into; that's the fun of playing in a small level and not in huge outdoor-reallife terrain.
-the turning and tilting is too fast. You have too much control that way. pressing the "right" button should not turn right at top-turning-speed instantly, but slowly increase and then decrease again.
-Think about making the mouse rotate the plane, not the cursor keys. I had the curser keys rotate my space ship in my game, it doesn't work well. Use the mouse. the further away from the center of the screen the mouse is, the faster the ship turns. your turns are too sudden and make it hard to steer. It's either turn or no turn, but the play should be able to decide how fast to turn. Reference: http://www.youtube.com/watch?v=iqSU-KDEtlQ
http://www.youtube.com/watch?v=yD_cKXgLRZI
-Make the camera sway a little more and put it much closer to the plane. it puts the player closer to the action and makes sure you don't see everything in the level at once.
-when hit, make it harder to steer the plane (broken wing?)
-particle trail looks weird when turning/tilting

keep at it. I think this game as a great potential!
The levels need work though
And making the game more action-packed would make it rock

... edit: and taking off like this would make me wanna play your game:
http://www.youtube.com/watch?v=xhD9QVQPAQg