Our game, NoodleRunner, takes place in a single view of your Ramen shop! 

https://itch.io/jam/gmtk-2019/rate/463198

Your city is constantly hiking the price of electricity, but you've only got one plug socket between all your appliances. Hard times call for hard limits; people can only ask for one topping! Assemble the Ramen while using as little electricity as possible, lest your account goes into overdraft and you have to close shop. Hopefully some lighthearted cooking fun !

I took the one screen idea a step further and had the whole screen be one color. Colors fade around as things happen in the game.

https://itch.io/jam/gmtk-2019/rate/462105

Only One Rectangle on 640x360 scren)

Simple, colorful platformer)  I would be very grateful if you have a few minutes to play my game)

Game: https://bloodpirat.itch.io/only-one-rectangle 

Rate: https://itch.io/jam/gmtk-2019/rate/460625

For players there is only one screen, so I guess it qualifies to be here:

https://aleconde98.itch.io/one-man-war

Code wise there are 3 almost identical screens with different objects in place. 1 for the title screen, one for the credits and the game one. (Using this helped me reduce the code)

Hi !
Enjoy slaying all the slimes and the four bosses. There's 20 levels. Can you beat'em all ?!

In this game you have only one bullet that you can pick up to shoot again !

Share your best time and the level that you reached.

Don't forget to rate !
Web is available ! Windows too ;)

https://itch.io/jam/gmtk-2019/rate/463391

Here is my game, though the one screen isn't the main ONLY ONE in it. (In the description in the itch.io page, please read what's after IMPORTANT. It's, um... important):

https://nitai99.itch.io/twisty-chess

each of the 11 puzzles in our game fit on one screen: https://ajgunsauley.itch.io/chunky-boi-escapes-the-space-gulag

Wanted games with main mechanics being only one room/screen. Got every game that used a screen at some point >.<. But the games posted here still are good anyways so it's fine to me ^^