Well, it IS on a Commodore 64 after all. At least SOME of the gameplay is similar to the original. And I believe the Colecovision and Zx Spectrum ports have the exact same gameplay.
Yes, gameplay is similar than other 8bit (Amstrad, Coleco, Spectrum...) conversions done back in the day.
Funny fact, my favorites levels in these conversions were ...the ones similar than 'the arcade,' meaning the ones with just a move on a certain timing (that's what they call "quick time event" in video game nowadays)
I was a little bit disappointed by the stages 'inspired' by the arcade but with full ...interactivity!
Anyway, everything labeled "Dragon's Lair" was just a pure dream back in the day!
Oh, and welcome to this castle, Dirk the Daring