I've lost too much time at work already trying to remember this game:
It's an old commodore 64 game, probably somewhere from the 80ies. What I remember is that you were a little guy with some sort of laser weapon which could turn dragons into eggs. You had to run past the eggs to make them fall off the screen into the water, disabling that dragon. If you didn't 'touch' the egg in time, it'd break open again, releasing the dragon (and probably angry or something, I can't quite remember). The laser beam itself didn't look typically laser beamish, but rather, circular: oo000000oo
You could walk to either the left or the right side of the screen, making it scroll (I think) and I also remember different 'floors/levels' vertically. Not sure how you were able to access them. I think I also remember a door and a key. Hmm! And a skull? Big hmm!
The scenery looked as if it was in some sort of castle. The dragons were green and not bigger than yourself.
You'd find yourself constantly zapping dragons, turning them into eggs, rushing to make them fall off the screen before they'd hatch. Sometimes you were just in time, sometimes they'd hatch right before the moment you'd touch them, you'd die. There was actually an animation on that egg, making it look like it was cracking, giving you an idea how much time you still had.
This game also had this catchy music I can still hum out loud today! As a matter of fact, my colleagues are looking weird at me right now.
Can anyone help me out!