This game is polished so well. It's actually a finished game, which i think is perfect for mobile devices.
For me, small quality of life features would make this game perfect. Such as moving placed factoris without deleting the connection to other factoris. But that doesn't affect my rating for this jam.
For the overall presentation you did a very good job with the simple but clean design.
All in all this is an amazing game for a 48 hour game jam. My respect, great work!