This was one of my favorite games on the NES, and a fantastic Metroidvania long before the term was ever coined. I loved the shmup levels, the huge map (for the time) and the large variety of weapons which facilitated different playstyles. my only qualm with the NES game was that it had a password system to bring up your game progress and the randomly generated password was like 17 digits long, meaning if you didn't write it down perfectly all your progress was lost; this is something being added to GOG could fix with save states. It's sad that more people aren't aware of this game, and I know Metroidvania and shmup fans alike would agree The Guardian Legend belongs in the list of best Mteroidvanias.