The idea of the molecule is interesting.

In the first sceen, red ground + white strange shape things look more like a desert with some bones. 

I though the concept was cool! The dialogue of the molecules was super well done and gave the story more of a personality. 

The different molecules are fun, and the keys are subtle but not impossible to find. I'd love a little more work to get the variables/ending working, and maybe a shorter repeat dialog after you've already spoken to the molecules could help the game feel a little more immersive. 

Pretty great theme that ties it all together. I wasn't for sure if there was an ending beyond finding the 3 keys or not. But it was pretty cool nonetheless.

Love the theming! I like how each molecule has a distinct personality. It would be cool if finding all three keys took you to some sort of end screen that showed the "world" you are setting out to create.