Hello Guillaume from Belgium (which part of Belgium?)
With a such video, I offer you a wild card here... you prove you're a real Dragon's Lair Fan, so of course welcome here
I think I can guess the story : you seems a little bit young for playing Dragon's Lair in the arcade in the 80s, but ... you fortunately had the game on Sega CD back in the 90s so you played it like a mad man, and now you're still able to play it very well. You don't have a MEGA CD anymore, so that explain the 'mega cross over' config used : original Mega CD version of the game, running on a PC computer that run a Sega MEGA CD emulator... and finally use ... a PlayStation pad
Your video is very impressive, because some scenes are really hard to recognize only with sounds... and you have almost no time to react and make the first move. In addition, some scenes are randomly reversed... and in that case, it's IMPOSSIBLE to guess the first move!
I remember doing something similar in the arcade, back in the 80s... but I had to see what was the stage first with me eyes, and then I continued to play that level without watching the monitor, and I can tell you the crowd behind me was very impressed
I must confess I was able to do that only on the easiest stages of the games
Now you really should try the real thing (the real arcade cabinet), or at last the 'authentic' gameplay, on Daphne emulator, or even on Playstation 3, the game has been released on the Playstation store, that version is very accurate.
I presume you're also fan of DL2 & Space Ace by the way?