Hi, 

I’m a Gaming Industry UIUX designer, for the longest of time,

I’ve been using the web browser to go to figma, view as desktop mode,
painstakenly go to the tiny layers, click on the correct frame to enter the Prototype preview mode.
The reason why I don’t use the Figma Mobile app is because, unlike the Web Browser version, there
is no way I can fit to height for the layout. 

/Fit to Height] while allowing width to be responsive is a necessity when designing for landscape mobile games interface. 
I hope to see this feature implemented so I don’t have to wait till I bring the High fidelity design to the game engine to test things out.