I've finished the game twice before, and now that GOG released it I'm on my third playthrough, about halfway in (level 6 now). But I still never managed to find a way to open the force door to the healing station in the reactor level. Does anyone know?

There is a button on the wall opposite of the force door, just stand in front of the force door, turn around, and there it is :) Click it, and solve the puzzle to open the door.

Uh. And here I thought I had looked around hard enough. Wall-colored buttons are the bane of my existence (see also Hexen). Oh well, thanks!

I find that puzzle to unlock that Healing pod very challenging so I used LOGIC PROBE. :D

A bit off-topic, I find a lot of the UI features this game uses to be incredibly ahead of its time. Not only do you get automatic, coxtext-based tutorial, but there's also stuff like the Logic Probe which integrates itself into the puzzle and gives you a context help with it, highlighting what you're supposed to click, as opposed to just automatically solving it for you.

Dunno, I thought that was really cool.