Hi, I need help remember an old arcade game. What I remember about the game is you controlled a man at the bottom of the screen. If I remember correctly he always looked up and held a gun. He stood on this platform, which on later levels of the game a little "trash can" looking robot would rotate around the platform to which you'd have to jump over as it came near you. The background scrolled down (giving the illusion you were moving up) and it kinda looked like a space building or something like that. You'd be assulted by birds (who dropped eggs if I remember correctly) and some other wierd stuff. I've looked through hundreds of screenshots of games that sound remotely similiar, but none even look remotely like this game. I'm wondering if it was a hack to something else.
One last thing, at the end of the first level the platform that scrolled down behind you would disappear, and there would be a giant bird in a nest, I assume it was a boss character, as I enver remember having the ability of killing it. I seen this game around 1986-1988 but it could have been older then that as I seem to remember the graphics being kinda crude.