I really like this game! I see some people saying the controls aren't responsive, but that's the whole challenge of the game. Maybe for the more casual player add an easy mode with easier controls, but I personally don't think you need it.
At first, I thought the movement was bugged, but then I realized it was from the planets having their own gravity and I was shocked! It perfectly adds to the challenge of the game - mastering not only the controls but also how you can use the planet's gravity to slingshot yourself in the direction that you want to go!!
One thing I was unsure about was why the fuel gauge goes down even when you're not using thrust. I get that it also acts like a timer but with the planet's gravity already making it hard to endlessly move upwards with little thrust I don't see much of a point in having it act as a timer as well. Unless you wanted to add a sense of urgency, then it's fine, but also have the rocket very slightly thrust forward always so that it makes sense why the fuel bar is going down even when you're not using thrust.
I also really liked the UI! The settings screen was very impressive, so much customization for a game jam!!
Overall, really fun game!