Yeah, this is the single-missing thing that stops me from purchasing and using the app

absolutely second this !

This honestly confused me a lot that Spaces weren't supported. I thought that was the whole point of Hyperfocus.

My thoughts were: I work in two places - at my home office (laptop + ultrawide + portrait monitor), and out of the home office (just using laptop). I was hoping to configure the Hyperfocus profiles to suit this workflow, that I could set up my apps differently for each profile, where when I'm working on just my laptop I use Spaces more heavily, like VSCode + terminal on one space, and my browser on the one next to it, to allow quick switches from full screen apps. Further, i'd have a separate space for messaging + email apps, another one for task management and productivity apps, etc. Having them separated by spaces when only on one laptop monitor greatly increases my ability to work.

On my home office profile, this changes completely, since I have so much screen real estate in 1 space, so i'd like to utilize the ultrawide for VSCode, and a browser window right next to it, then on my laptop screen i'd have the messaging and email apps, and on my portrait monitor i'd have those task management and productivity apps, for example.

I imagine that I could have a separate profile set up for "break time" as well, that would minimize certain apps, and show other ones.

See screenshot for how i'd imagine you'd set it up, where for each "screen" you can tell the application which space number it should belong to.