There was actually less programming needed than I anticipated. So let's just say I was the one who got more sleep in those 48h XD
Designing the game mechanics was done by both of us though.
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Haha! My brother is an artist so I know how that goes. I bet that took a lot of work. My team on this jam (teamwintergreen) are both programmers so we didn't do any art at all, and we chose a very simple core mechanic, had the base game running in about four hours, and then it was just thinking up crazy level designs and doing little bugfixes and adding a bit of UI and control tweaks. Most relaxed game jam I've ever done. :)