The next build will have a menu that auto-centers - icon at the top of the page and buttons at the bottom.

Your goal is to send your ship (the yellow dot) through each of the checkpoints (red circles) before returning back to your home planet.
First, launch your ship by choosing a direction and a speed using the mouse and the left mouse button.
Once you are moving, use the left mouse button to 'boost' your ship in the direction of the mouse cursor. This will consume fuel.
You can hold the right-mouse button to speed up time by 10x.
Once you've collected each of the checkpoints (changing them from red to green), you can then return to Earth.
Your score is based on the total amount of fuel and how close to the landing zone you were. The landing zone is shown as a pink glow on one side of the Earth.
Challenge yourselves - and others - to get the highest score by using the least fuel and landing perfectly.
In easy mode you only have your checkpoints and the planet you need to land on. When you launch, you'll generally fall into an orbit unless you launch with too much or not enough power.
In challenge mode, an asteroid appears. It's stationary, but it gets in the way and influences your ship with its gravity, making your orbits degrade over time.
Hard mode introduces the moon. This spins rapidly around the planet and makes landing and close flybys of the planet a dangerous idea, as well as adding ever-changing influences to your orbits. You'll need to focus on timing for launches and landings.
Below are a few ideas for the future...
Some identified issues with the current build (other than general incompleteness)...