Really cool idea! Managing depleting batteries is a fun concept and the game feels really polished (despite the description claiming otherwise). This is one I had to pull myself away from to go and do other games, so that's always a good sign in a game jam! For feedback, I think selling the crystals could have been instantaneous. Waiting for them to convert felt a little frustrating, especially when I was maxing out my cargo each load and it didn't really seem part of the intended experience. But I had a lot of fun with this one!
Oh I forgot to mention the art! It was absolutely amazing!