First of all, congratulations on completing your project well before the submission deadline! These jams do not require you to dedicate all your time and should be fun and low stress environments to practice your craft. The fact you were able to create this experience completely from the ground up during this time is very impressive. Definitely point out the fact that you did all the custom models and music to increase others' awareness of your efforts.
This game had a lot to love. The environments on the planets each felt different, the procedurally generated names adds charm, and the music -- oh the music! You should release the OST for download :D I especially appreciate the UI elements for the level select, intro, and for the Scanner HUD.
For me, I would have loved to see more gameplay elements that would either challenge the player in their journey to utilize the scanner to find clues on each planet -- for example. I think taking advantage of the randomization and further developing out a puzzle system that is different on each playthrough could be really compelling. On my first playthrough, I actually thought the Bean Obelisks were a puzzle because when you scan them, the sound they emit at different differences is a different tone. I assumed i had to figure something out with that detail!
Overall, a great experience that could only be improved.