Thank you for playing and for the feedback! I think a more obvious unpause-with-mouse would be good (aside from the pause/play button up top) and I hear you on the building-offers matching discovered terrain.
>> those discoveries were part of the fun
This was the biggest design decision I made. I had a 'glossary' panel planned that showed all possible upgrades, bonuses, resource values, etc., but opted for the 'discovery' feel (and it saved time for the jam submission).