This rad! A very ambitious and potentially large scope project for a game jam. I am impressed by how much has been realised here.
I encountered a situation where I didn't have enough cargo space to take on the remaining missions at a planet (I had already completed the ones that I could afford to take), which effectively ended my runs.
The upgrade system was not obvious to me, and unless it was explained in chat, I suspect I would not have discovered it on my own. It also wasn't immediately clear to me that resources that flew off the screen during the transit phase were collected.
I noted in chat when you joined my stream that the Linux binary did not have executable permissions. It would be good to either resolve that as part of your build process or make note in the install instructions on your game's page.
I can see a slightly more polished version of this being really enjoyable for long play sessions. If you continue development, I'd love to play more!