This is a fantastic little platform/exploration game. Cute and atmospheric graphics/audio. The game design, controls and execution are pretty much flawless. Difficulty and length are spot on.
It's possible to complete it on an original DMG, although the bats and arrows are near impossible to see. A backlit modded machine or a SGB is recommended.
New or old; easily one of my favorite games for the old brick. Wouldn't mind getting this on physical media.