Super Donkey is interesting. It’s an unreleased platformer that looks an awful lot like Yoshi’s Island artistically, shares some mechanics and technical elements, but is otherwise a completely different game.
I need to give that unreleased english localisation of Gargoyle’s Quest 2 for Game Boy a try too.
I’m also glad we got to meet this guy:
The whole situation reminds me of the massive Radiohead leak from last year that dumped 16 hours of unreleased work-in-progress versions of OK Computer-era songs, some of which were totally different from the final versions or in some cases were totally unknown and new. I spent days listening to that whole thing, had a great time, but haven’t really gone back to it since.