I’ve chipped away some small chunks, leaving behind a mountain of dead protagonists.
To recap from last time: I started in a metal room; then went through a force field, into a vacuum, and died.

“…Part 2, where you either become the world’s greatest hero or go to a quick, horrible death.” Via Giant Bomb.
From Savage Island Part 1, I remembered HOLD BREATH worked. It “works” here too but rather than your lungs becoming a gooey mess you are ASPHYXIATED.
After some toying around I discovered EXHALE OUT was responsive.
Try: “BREATHE OUT”
(The game clearly understood what I meant: why not just parse it? The same issue came up with Cavern of Riches. I can understand trying to train the player in a system to make things easier, like Adventure letting the player know they can just type W rather than GO WEST after they’ve done it enough times, but this case was just an alternate phrasing.)
I found if I did HOLD BREATH, then stepped into Vacuum and did BREATHE OUT I could survive a little longer. Four turns, to be exact. Long enough to fiddle with the console to no avail (there’s a lever that won’t budge, dials with “alien script” and a button that asks for a voice command) but also to make it to another force field only to die.
If I could only survive just a little longer, I could make it through the second force field (and presumably to non-vacuum safety).
A lot of fiddling later and I remembered something I saw 30 years ago (!!) from Kim Schuette’s Book of Adventure Games. I was flipping through the back looking at hints for a different game but saw HYPERVENTILATE on one of the pages. I clearly thought it was absurd at the time and it stuck with me, because I remembered it here. (I’m not exaggerating on the number of years!)

Possibly the text adventure record for “most impressive verb required to beat the game”.
Then when I went in the force field and tried to BREATHE OUT, I was able to survive for an extra two turns in vacuum, long enough to get through that force field I was dying at previously.
The hydroponics hide a FLOWER where typing SMELL FLOWER says “I feel briefly sedated!”
The display case has a Neanderthal (like Part 1). If you push the button a voice tells you
WARNING – Non-transfigured controller of seed specimens has been released
and the Neanderthal follows you around, says Argh, and eventually hits and kills you if you hang out long enough.
North a bit there’s another console (again with buttons, dials, and a lever). The lever won’t budge on this console either, but the button has an impressive message:
That’s pretty much it for progress.
In addition to the hydroponics area, I was able to go to a lifeboat exposed to space, and jump to, er, freedom.

“Stop, stop! He’s already dead!”
There’s one more force field with a “red blinking light” but I don’t have enough air supply to get through (if it even will let me through without dying in some new horrible way).
Is “Neathanderal” supposed to be “Neanderthal” or is this a deliberate alternate spelling?
That one’s my typo (although I had to load the game back up again to make sure). It can always be confusing given 1981 adventures aren’t known for great spelling on their own.
Man, I played this game years ago… probably around the time it came out on a friend’s father’s computer. I could never get beyond the forcefield and for decades it haunted me. I could never find the game again nor remember the name. Thank you! Itch scratched.
if the Neanderthal says “Argh!” too, maybe you can trick him into a vacuum to kill him? Why you should do such a thing I don’t know. (To search the corpse?)
I have worked it out, You do need him alive.
The key word might better have been PSYCHOTRANSPORTATION.
I’m sitting back on this one as I’ve previously spoiled myself thoroughly on this game (both installments). No regrets.
I will note that BREATHE DEEP also works, and has the same effect as HYPERVENTILATE. This may be why the game insists on you using BREATHE OUT instead of EXHALE; because the verb BREATHE can be used with different modifiers to different effect.