At last! Took 4 months, but now Alpha 6 is now complete! New Tech Tree, Contracts, endgame, Prototypes, new economy, etc etc etc
If you haven't been playing on the experimental branch, here is a recap of everything that has changed:
https://steamcommunity.com/app/671440/discussions/4/1698300679774682030/
https://steamcommunity.com/app/671440/discussions/4/1698300679778208903/
https://steamcommunity.com/app/671440/discussions/4/3307213006829975566/
https://steamcommunity.com/app/671440/discussions/4/3307213006845240157/
https://steamcommunity.com/app/671440/discussions/4/3307213006848884416/
TLDR: a lot of things
Just go and enjoy it!