Looks like you might have the classic "wrong case filename" problem. It doesn't work... are you using wrong case in your filenames? ("xyz.png" instead of "xyz.PNG" for example)

Not bad. It would be worthwhile adding sound, I think, and to have the opponent ships exploding rather than just disappearing when they are destroyed.

You're trying to write a text file; you can't do that from an applet: java.security.AccessControlException: access denied (java.io.FilePermission rec.txt write) at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323) at java.security.AccessController.checkPermission(AccessController.java:546) at java.lang.SecurityManager.checkPermission(SecurityManager.java:532) at java.lang.SecurityManager.checkWrite(SecurityManager.java:962) at java.io.FileOutputStream.<init>(FileOutputStream.java:169) at java.io.FileOutputStream.<init>(FileOutputStream.java:131) at java.io.FileWriter.<init>(FileWriter.java:73) at Records.inicia(Records.java:53) at Records.<init>(Records.java:13) at Scenario.<init>(Scenario.java:29)

It looks like the "completed" status is stored in a static field? That's why "reset" won't work and you can only play once.