Does anyone else remember this game? It was most joyful. You were this little guy who ran around lots of screens, trying to achieve something (hmmm - that sounds very specific). When you ran onto a new screen, all these monsters would start to appear, so I generally played very fast, running from one screen to another, picking up objects, and trying to get all of the keys, before the creatures appeared on the screen.
The version I had was for the BBC Micro. If there's anyone out there with a copy, I'd be amazingly happy if you could see your way to getting me a copy. If needs be I could convert a BBC version into a PC version. I'm very familiar with BBC BASIC and I've got the resources to do it.