It is surprising how big discrepancy can be there between the actual work needed to do a change, verus how it might be percieved.
Changing the balance and structure of recipes by shuffling things around without actually altering existing mechanics, can make huge gameplay changes. But it is just about editing few prototype definitions with minimal risk of breaking something.
Making graphics might be complicated, but if it is already done in some acceptable state, it is not something that would make the game unplable.
So these aren't really that bad. I was much more nervous about my last moment rework of how the rocket/satellite/space platform UI gameplay etc. work in base game versus space age. But it was done already at the start of this week, and seems to work fine.
The next week, we plan on focusing on specifically just on testing of what we have, bugfixes and stabilisation stuff, with only very low rick changes allowed. The last week, we basically want to make internal release candidates and make sure we didn't forget something.
Changing a release date at this point would be a coward move.