Thank you for all the feedback and constructive criticism. It is very helpful.
I like your "space billiard" analogy.
I'll look into improving clarity on fuel gain, and how the star system is laid out when I released a post-jam update.
On the fuel decreasing passively, that is a core part of how the game is designed. However, I will most likely add in normal and hard modes. In the normal mode, passive fuel decreases will be significantly lower.
Thanks again for the helpful and though provoking feedback!