Death Wish 3 Ending

Hello fellas,
I didn't find any thread about this, but my question is pretty simple: does Death Wish 3 (Gremlin Graphics, 1987) have an end? I've spent a few hours playing it and killing many bosses, only to see new enemies arise over and over again.
Once I read that someone read the game inner codes and there was a message about the end, but I was never able to confirm it.
Can anybody confirm it? If so, what does it take to reach the end?