Oh, yes, my apologies. Creating a new save file is currently the only way to lower difficulty. Adding that feature to the game is something completely doable within the game and we want to add that with the in-game setting menu.
Alternatively, if you are feeling adventurous, you can also edit your save file located in %appdata%/locallow/StickyKeys/StarSpawn. They are plaintext json and relatively easy to edit ^^