All my little games start with my sitting down with pencil and paper. I first sketched a couple of space themed ideas but the one I thought would be the most fun to build involved a space craft harpooning objects in order to propel itself through space.
I decided to go with the latter, mainly because it was the easier option given the timescales I'm working with but also by adding a gravitational element I would be able to add a character or planet to the bottom of the screen. The obstacle will be constantly pulling you down, preventing you from remaining stationary in the game.
I think the planets add a really creative border to the game and offers an element of risk during game play.
Below is a short video of the progression of the game's evolution, complete with game play at every stage. You can play the game here.