Interesting idea and take on the theme.
I collected 10k of credits (primarily just travelling back and forth between distant planets, but could not "Clean Up" Martinsen, just clicked button and nothing happened...
Understand the time constraints and agree that navigation (i.e. map/autopilot) would be nice. I would also recommend having the guidebook remember what planets produce/manufacture - and maybe even buy stuff for. Although it is nostalgic to use pen and paper when paying game (thinking old Commodore 64 RPGs), really no need to make players do that now.
Although you slowed down with extra goods, it seemed to be better to just load up on goods and fly back and forth. Hope you continue work on this as I think it has promise.