Update #2 [Thu 21st Jan, 2021 06:30 GMT]: Final Sword, the game featuring background music from The Legend of Zelda series, has now returned to the Japanese eShop as a Definitive Edition release.
The Zelda-themed music has reportedly been removed. There were also some asset issues as well, but it's unclear at this stage if they've been removed or even swapped out.
Here's an incredibly rough Google translation of the developer's latest Twitter message - thanking fans for all the support:
"Thanks to everyone's support, we were able to release it. Thank you from the bottom of my heart. We are still struggling to develop even more interesting games. Thank you for your patronage of Final Sword Definitive Edition. (The story is the same as the previous work.) Thank you very much."
Update #1 [Mon 6th Jul, 2020]: It would appear that Final Sword has now been removed from the Japanese eShop after it was discovered that it contains music from The Legend of Zelda franchise (thanks, Japanese Nintendo). While not yet confirmed, it wouldn't be surprising to see similar takedowns follow worldwide.
Original Article [Sun 5th Jul, 2020 07:30 BST]: Earlier this week, a company called HUP Games published Final Sword on the Switch eShop. If you've never heard of this game before, it's described as the "original action RPG" for Nintendo Switch and allows players to enjoy "powerful battles" in an open-world setting for $17.70.
In reality, it's a mobile port and the title uses generic game engine assets. To top it off, it also features music from the Nintendo series, The Legend of Zelda. GoNintendo notes how the "stolen music" playing in the background "straight-up rips off" Zelda's Lullaby.
We're not sure how this one slipped by Nintendo, but if we were to take a guess, it's probably because stacks of games are getting approved for the Switch eShop on a weekly basis.
Now that the word is out, Final Sword is expected to disappear from Nintendo's digital store in the coming days. If we get any updates, we'll be sure to let you know.