The theme was "Every 10 Seconds" which I think is a pretty bad theme, (it's almost good, "10 Seconds" would be a great theme!). In defiance of the theme, I implemented a mechanic that used the theme in a pretty stilted way. Then I proceeded to otherwise make a game based on a theme that almost won but didn't: "Harvest." Hilariously, "Harvest" did win as the theme for Ludum Dare 52.
This was the first game I made with Adam (aka Crashtroid), who you might recognize as the composer of Peglin. He already had a team for the jam but he said he could send me a quick track with any extra time he had. I managed to squeeze out a "second" track out of it with an Audacity low pass filter.