Unique concept, although it does have a few problems:
- From what I have noticed, only one planet's gravity affects the ship at a time
- it starts off too hard
- it should've let you place all the planets then simulate it, in this version it's more of a timing game
- there are some unusual design choices, such as the red ring, having to left click, then right click to place a planet, could have just been two left clicks
still great considering the time it took.