It's absolutely worth it! I grabbed it from GOG.com, since when you buy it there you can just choose to download the base ROM-file on its own instead of having to run any installers and retrieve the file manually, which is handy if you want to drop it straight onto an emulation-specific device (and essential for me, since I use ARM computers, not x86, and these sorts of things still usually only target x86). I'm currently playing it on an Anbernic RG351MP handheld, using the excellent 351Elec OS - it's almost like having a new game made just for it.
Oh yes! There are SO MANY good things like this out there, nowadays, both free and paid - more than ever before.
I'm a big fan of the Game Boy line, so I've just looked this up, and, with it being inspired by the likes of Kirby's Dream Land and Super Mario Land (two of my all-time favourite games for the original Game Boy), it looks like exactly my sort of thing. Thanks for the heads-up!