I'm preparing a huge update for the demo, and for those of you adventurous enough, daring enough, to venture into the unknown and be the first to encounter the bugs I probably created, well, you can find it on the testing branch.
Among the things added in this update:
freighter condition and repairs
taxes
buying price info on your cargo
procedural trade missions
and countless bug fixes
Please post any bugs you find to the bug forum, so I can fix them and update the demo for the main branch for those less daring, less courageous.