Nice start :-) Couple of immediate suggestions that spring to mind, it'd be nice if you could go diagonally as well rather than just back forward left and right, and the menu selection can be a bit jumpy at the moment, it might be better if you altered it so that it only advances one option per key press? Regarding the high scores, how have you implemented them? If you've used the high score classes available on here then you shouldn't have a problem and I'll look into it if you're having issues - but if you've used your own database and tried to use it on the gallery it won't work because of security restrictions (java applets won't allow any connections unless they're to the same server.)

Sounds like an interesting project, hope it goes well! At the moment this scenario doesn't add any objects by default though hence the blank world on the gallery. If you're after how to add the objects you can have a look here: http://greenfoot.org/greenroom/images/1/12/Adding_objects.pdf Hope that helps :-)

One suggestion you could change - it might make it a bit smoother (in terms of fps) if you up the speed to about half way and move in smaller steps - at the moment it feels a tad jerky to me anyway. Oh and the image of the snake going to the left doesn't seem to have a transparent background - you know you can use methods in the GreenfootImage class to just flip the image rather than having two separate ones? :-)

Is level 9 the one where you're surrouded? If so the trick is to bounce the ball off one so it hits another off at the same time :-)

"I think you need to use SmoothMover! The plane only flies at multiples of 45 degree angles." Is the class you're thinking of not just "Mover"? From memory SmoothMover is the one that works with double precision on x and y values :-)