Very clean look for a jam game. The UI, in particular, is pretty simple and intuitive, which is crucial for this type of game.
However, some work on difficulty balancing is needed to make it interesting. As it is, building each planet and machine in order as soon as they become available is enough to net an easy win. Since each object can only be built once anyway, the player doesn't really have to ponder his choices.
Allowing several machines of the same type on a single planet instead would make the player think about the efficiency of each of them depending on the planet's specific resources, and already create some sense of strategy.
Overall, you've still got quite a nice foundation for your game.
I'd love to read your comments about my entry : https://itch.io/jam/blackthornprodgamejam2/rate/379463
Interestingly enough, it's also about gathering resources to leave a system of planets, but with a totally different take on it.