Cool game, but the long iteration times got a bit frustrating. The ship was so slow, and every small change required you to wait five odd seconds to see whether what you've made works or not. The holes had such a huge range, so even the smallest change to config could completely change trajectory, which is okay, but the slow iteration time made fine tuning your setup slow. It would be nice if the ship could be sped up, reset instantly, or better still, if a live trajectory could be shown that immediately updates. The goal could also be bigger to reduce the need for fine tuning.
Otherwise tho, the game was very innovative, and the physics of the system was pretty cool. Nice work with the simplistic graphics. It was also really neat how the sounds of the black holes were '3D', with the volumes in each ear adjusted to make it sound like you're in the space craft. Good job with the game, hopefully you get a good rating for this!