I mean, it ran on Switch. It's also Unreal 4, so you can make the internal resolution as low as need be.
TBH, Japanese developers have been good about these kinds of things with Unreal 4. Might just be the engine being so well documented.
I can't find any screenshots larger than 720p, so I'm guessing that was the games max resolution on Switch. The screenshots make it looks like the hud was updated to look crisp at 1080p.
What you did there, I see it
As the game tried to imitate the retro style, the 720p resolution is not that bad (world map was kind of blurry though) but I can't help to think that the same game should de able to run at 1080p on the Switch. If the next game comes first to the Switch as a console exclusive (I think it will, considering how well the first one sold and the partnership with Nintendo to publish the game in the west) it would be nice to see a good res. upgrade.