How do I reset my progress on SteamOS / Linux?
I read that on Windows you can delete the registry folders and keys via regedit, but that didn't help me much. I didn't find any recently changed files in the game's Steam folder and there was also no Defend Your Life folder in .config or other common places.

//edit
While searching for the files I'd have to delete I stumbled upon the reset button in the main menu. Sigh.. For future reference, the config and log files are located at ~/.config/unity3d/Alda Games s.r.o./Defend Your Life!/.