Hey, Nice start - couple of things though! Firstly the game is really really long. Probably the longest I've seen - not in terms of gameplay, but in terms of width! You might want to investigate scrolling worlds if you want to keep it with a reasonable length, it's really annoying having to scroll to get to the right half of it. Secondly, I kept getting blown up by seemingly no-one - are the images for some characters really big and mainly transparent? If so, trimming them to size would solve that issue :) Keep going!

If you're looking for other things to do, some delay on the bird's weapon of choice might be helpful - or perhaps some restriction so he can't attack constantly. Or how about he has to eat food and then wait a while first... ;)

It doesn't seem to work at the moment - if you can't work out what's wrong, you can upload the source code and you might well have some feedback as to what's wrong :)

You seem to be running an old version of Greenfoot - 1.5.1's out now so upgrading would be wise! Yup, as Builderboy said it's the age old image problem (image names are case sensitive on the gallery, but they may not be on your computer.) In your case, it's the world backdrop causing the problem - if you change your "back.jpg" in your world class to "back.JPG", it seems to work fine. As for why I recommended upgrading, 1.5 and onwards will catch this case sensitive issue at runtime and tell you exactly what the case needs to be - pretty much eliminating this problem (you're not alone, it was one lots of people fell for, including me once!) Some programs like MSPaint seem to love saving with upper case extensions, but usually they're typed in lower case, which is usually the cause of the problem.

Hey, Nice idea, and well coded too - it's good to see someone using comprehensive javadoc comments and nice indentation!

Slight bug - if you jump into the lava whilst shooting constantly, you don't die straight away, and when you do you just fall down rather than the epic mario style up and down finish ;)