Nice game, visuals are nice and I see you made all of them, good job with that. Sound effects are nice too.
One thing is that it would be nice if there were some stuff to do, like carrying goods from one planet to another or something like that (I read description and it just said survive the longest), though of course that is hard (almost impossible to make in 7 days, especially that you worked alone), it's just something that you can implement if you want and if you like it after game jam.
Overall, nice game, though as I said it could be expanded, but nice start, well done
Good luck in game jam :D