This game was different! It had jump puzzles, not a lot of fighting, but also not a lot of leeway for not fighting well (depending on difficulty setting), it had a story. It also took me a while to master, but master it I did!
And it was my personal favourite for video game music on the C-64 (closely followed by Katakis, The Great Giana sisters and ... pretty much anything Chris Huelsbeck laid his hands on). Oh the things they did with the good old SID chip! 30 years later, I still have one of the melodies popping up in my head occasionally. Back in the day, I'd beat the game just to leave the music from the last level running in the background while doing something else.
The only drawback of a potential GOG version would be the missing out on the really cool EagleSoft intro on the *ahem* private copy I had. The benefit: I'd finally be able to buy it for real.