This is awesome! I don't know if you knew this before making this game, but there is a concept in physics called a "Gravity Assist." This concept is where a spaceship uses the gravitational fields of a planet to alter its speed and direction (More detailed explanation: https://solarsystem.nasa.gov/basics/primer/). With a little more time this game could be used as a way to get students interested in physics. Amazing work. By far my favorite game I have played today.