Given that Cuphead is styled after cartoons from the 1920's, it makes sense to see what the game would look like on an ancient screen. A black and white CRT screen, to be exact.
The game was broadcast to the 1984 TV through an HDMI to RF converter, which takes a little bit of patience. But it's worth it for the unusual experience, even if games like Cuphead lose a bit of visibility on the edges because they're designed for widescreens.
The cutscenes look pretty good, and it's only in certain scenes or instances where text boxes and characters don't quite fit on the whole screen. But it works for the most part, and it'd be entirely possible (although not ideal) to finish Cuphead this way.
Now I'm starting to wonder: how would the Mini SNES look on a black and white CRT TV? It's just a simple HDMI connection, and you can play all the games in 4:3 mode.