I never discovered carbon, I did prestige. Also the research centers, when at lvl5 the upgrade button has text "Upgrade" (as oposed with price before) and is clickable, but does nothing
Congrats for making it through all three modes! Prestige mechanics are not really implemented yet, want to get the basic gameplay right first.
The research center bug is already fixed for the next update, there should be unlimited upgrades now. The carbon discovery is not triggered indeed, it should happen once you scan your first system with carbon, will take a look.
What did you think about the gameplay mechanics in the later stages of the game and the transitions between them?