Thank you, that's nice to hear! An easy mode would have been a good idea, but it's a game jam. The scope can't be too large, and if I only had an easy mode, then it would have been too easy for others.
Glad to hear you liked the gravity! I agree that we could have made it a bit more clear that there even is gravity. The gravity assists also add a lot of cool maneuvers you can do, and I think it's the gravity the feature that really sets our game apart.
The idle draining of the fuel is to give incentive to keep moving, rather than to stop and take a break. It's slow enough that it usually won't cause any trouble, but it pushes you to keep going.
I do think I should be honest about the UI. I have a sort of template UI in another project, with a few simple scripts for moving UI objects around, so I just ported that over. I did that in another game jam I did awhile back, and it really helps to not have to put too much time into a main menu.
I'm really happy with how the game turned out, and it's good to hear you are too!