The first stage is so soul-crushingly tedious and boring (I had to retry like more than 10 times at least) - and I totally love that! It's just such a perfect example of procedural rhetorics in action - really makes you think about how lucky our ancestors in Proterozoic must had been :D
The contrast of the really easy 2nd stage probably theoretically makes sense (to show the player how huge the advantage of being the first actually was or something) and I must admit it feels quite rewarding, but still it somehow feels out of place and breaks the immersion for me. The victory cutscene is fun.
The visuals are nice but their placement apparently still needs some polish.
Overall a nice game that passes a message to the player in a really cool and unique way.