Essentially yes, but with very tongue in cheek humour.

Edit: grammar.

You nailed it in one.

Well, the first third or so is subnautica in space.

I love Subnautica and that's why I've tried this one but couldn't get into it. Just not enjoyable. Maybe later on, but I had lost my patience while getting through the first stage.

I've played it with Proton without any problems.

In my experience when I had a Steam Deck, many games that don't have the supported status on it do work without issues, they just haven't been officially tested.

Should work fine on Steamdeck. It works fine under Proton on Arch (which is essentially what a Steamdeck is).

Sounds like it actually does work: ProtonDB | Game Details for Breathedge https://share.google/QRPjfVpI2hbW7jeam

Check out proton db, it's way more accurate than steam verification

Well it's free now so no harm in trying yourself :D