Megami Tensei Gaiden - Last Bible II (Japan) [En by EsperKnight v1.0] ROM

From the translator: "If you’ve ever played an 8-bit or 16-bit RPG, you already know exactly what this game plays like. I know the term “Dragon Quest Clone” is cliché, but this game fits the term to a button. Except for in battles, everything is represented by 16×16 pixel sprites and tiles, and you interact with your environment and inventory via menus. Of course, being a game that is part of the whole Megami Tensei canon, it kicks a lot more ass than most Dragon Quest clones, and has mythological/theological/occult bent to everything in the game. It looks pretty neat." Translated by EsperKnight.

The story has some interesting twists, and the music is really good. As well, the monster illustrations are also fantastic, and the game is actually mildly difficult. Well worth at least a try, and definitely one of the best Game Boy RPGs.