Moonstone: A Hard Days Knight

I <3 that, and been waiting for a long time, but; How I strike? What key? There's no manual apart from the original one. Please help :)

I remember spending hours / days trying to get this to install on my Amiga hard drive back in the day. The floppies were almost worn out and it would sometimes crash trying to load. Adore this game, very hard - some luck required, but even 25 years since I last played it I can perfectly remember the music and text - brilliant brilliant game.

Wait a minute: where's the Mac version?! :(

This is an uncontrollable hunk of junk, with no difficulty-curve, or any meaningful tutorial. Also one of those old games which entirely relies on manual to tell you WTH is going on, what your are supposed to do. Oh, and redifining keys - don't even dream about it. Also classic GoG-style this is missing feature (the music), and has controller-issues GoG forgot to fix. I'd be truly interrested how GoG's legal work, because it seems they grab a game from some abandonedware site, put it on their shelves, and sue everyone else who still has them.