Absolutely love this game! Almost done with the pre-built puzzles; there is a LOT of content. I'm not sure how the custom levels work, however; the in-game community page is empty, and I don't see where to put puzzle files in the game folders. I am on Mac if that helps.
Loving the game so far, but incredibly confused on how to save the game. I can access the "Save to which file?" menu, but I have pressed literally every button on that screen to no avail. On the MacOS version.