This is really nice! The process of exploring the whole map and collecting resources was satisfying enough that it kept me going even when I had more than I needed. I really liked the visuals and the fog of war effect, as well as the cool "magnet repelling" borders around the edges and the map feature. I think it would be cool if the planets you unlock also clear the fog away from themselves without you having to manually fly around them. I'd also like to see some more challenges, even in a low-stress casual way--for example, what if there were asteroids flying randomly around the map that you had to avoid? They wouldn't even have to kill you, they could just cause you to lose some of the resources you'd gathered. Also, echoing puppetsquid's comment, it would be a nice polish to make sure items don't spawn outside the border of the map.
Anyway, good job with this. I saw your post about wanting to become a professional game dev and I think I'm on a similar journey, so on a personal note I wish you luck and hope you're able to make the things you want to make and get paid for them. :)