I'm one of the two programmers on the team. The way actual work on the project was divided between us is sorta all over the place, but I did a lot of work on player functionality, controls, and general optimization, amongst other things.
That was just my main focus mind you. As all nine of us working on the game are founders, we've all also had a hand in the design and business side of things, though certain team members were more focused on that than others.