Basically I worked the most in the initial phase, about 9-10 hours every day to get a prototype running. A bit crazy, I know. I had the idea for longer and the theme fit perfectly. I also have a lot of experience working with music, art and programming which makes me work quite fast. I worked a lot with cellular automata and fluid dynamics at university, so I had that implemented quickly. Most time went into the art and programming. I also reused some general stuff like screen transition and animation code to save time. Mostly those optimizations and general good planning and organization got me that far. Get yourself an analog notebook and a pen, don't do it digitally!