Ganbare Goemon: Sarawareta Ebisumaru! is a Japanese-exclusive exploratory Game Boy brawler from Konami. It's obviously part of the Ganbare Goemon series, which is known as Legend of the Mystical Ninja in the US. Like the Goemon games on the NES, it features light brawler gameplay with an emphasis on light RPG elements such as exploring towns, finding items, and fulfilling objectives to proceed.
There's another Ganbare Goemon game on the Game Boy (localized in America as Mystical Ninja Starring Goemon) but it's an overhead shooter instead of a brawler.
The title translates to Ganbare Goemon: The Abduction of Ebisumaru! Ebisumaru is Goemon's thief friend who appears in almost all of the games. He's also based off a real-life Japanese legend.
Goemon on Game Boy is not great. Its combat is extremely simple, and you only fight two dudes at most so it's a cakewalk. The game mainly focuses on exploration, which is not particularly well done. The presentation is so-so. Also, it can be hard for non-Japanese speakers to figure out without a guide.