Greetings.
I see the demo was just posted yesterday, so you might want some comments. I was able to play the demo through to the end, which is good. I did not encounter any major bugs, which is good. The demo ran in Wine, which is good, though if you do a Linux build you might send it to GamingOnLinux whose editor seems to love games like this and would probably write an article.
The only issue I noticed was that after I went to the second planet with the snow tileset, when I went back to the first, or any other of the first type, the rendering was much slower than before, so scrolling around the map was slow. But the snow types remained fast when I returned to them.
I don't think the demo experience would engage me beyond the first area, except to see if there was something else to the game in the next stage. Requiring more thought from the player in resource gathering could introduce some challenge, but I also hope you have an interesting story to keep the player wanting to move forwards.
I saw that two of the dev logs had to do with art and colour-with-a-u. I am not an artist, so I can only say that I thought the art was fine, and colours tended to the side of understated rather than garish, a good choice for the player to look at for long periods in my opinion. Some of the resources didn't immediately jump out, especially on hills, but it wasn't a real issue.
Anyway, I liked what I saw, and good luck to you.