Whoa, this is such an undeservedly hidden gem! It's weird how such a good, well-polished game managed to get off the radar just like this. It surely deserves to be more known.
I've just beat that last level. It was so punishing that beating it felt very rewarding. (:
I loved the mechanics available (specially the ones after Simulation) and how they were presented (letting the players discover them through level design was a nice touch!). It takes quite a while to actually cut to the action, but once you manage to get there, it gets very interesting.
In special, I loved the boss level for Petri 2, whose design was quite a surprise. Human 40 was tricky; and I spent way too much time on Human 39, which was frustrating (but made the relief of never needing to go through that ever again all the merrier). A thing that could have helped present purple at Human 26 would be coloring the bottom row purple instead of red.
The difficulty is overall well-balanced; with the latter levels being quite the spike in challenge.
Also, loved the quirky plot and the silliness of that level-start blob. It was delightful that the dialogue was always connected to the player's experience.