The art is superb. The atmosphere is just right. The hints at background lore are just the right amount of vagueness. Brilliant execution! Really polished!
My only suggestion would be to color-code the valves and solutions. First, adding some color to the valves would make it more obvious they are interact-able elements (I didn’t understand this at first). Second, there were a bunch of times I’d fill the test chambers, and then forget which valve I used for which solution! (Not sure if I’m the only one to do this)
Seriously though, great work! I love it!