A nice concept for a puzzle game. I found the physics simulation meant that some of the puzzles relied heavily on trial and error, and others felt like I'd "cheesed" them, due to the ship bouncing off a moon and happening to go in the correct direction. Something that made this worse was tiny changes in the position of the moons having a large effect on the ship. Perhaps an initial trajectory line would alleviate this. I thought you explored a lot of mechanics for the puzzles, and did a good job of adding them gradually to the game.