not that i know much about that sort of thing, but shouldn't this be 1.1?
It is 1.0.3 because it does not a significant amount of content. Basically I'm reserving the minor updates (like 1.1) for when I add new levels. Yes you can argue it should be 1.1 but it doesn't really matter that much. https://en.wikipedia.org/wiki/Software_versioning