Hi Paul. In most of my games I don't usually set a specific frame rate, but I have in this and a couple of others as without it, it runs far too fast.
I'm likely to use F for fullscreen/Window, H for Pause and C to switch to Spectrum colours (if available) in future, so are there keys you would rather I use?
While we're here - here's a little tip that might make the game a little easier: You can go right to the bottom of the screen and run along the bottom. The baddies can't go down there so you're safe! I never knew this until I started playing the original game non-stop for this remake!