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« Last post by RABicle on Yesterday at 09:31:00 AM »
On the topic of Nintendo releasing retro games, the smart and handsome question asker left open the possibility of Nintendo finishing off an unreleased game. And they've done this, at least one and more depending if you count localising.
So my firth thought was Star Fox 2 which was finished off and released for the Super Nintendo Mini Classic.
The other option is the often forgotten localisation of Fire Emblem™ Shadow Dragon & the Blade of Light, which was available as a standalone purchase on the Switch eshop for a limited time. They even did a physical version with a commemorative NES cart.