Version numbers on this game are consistent. A number change after the first decimal point is an actual content update (ie 0.16 to 0.17). A number change after the second decimal point is a primarily bugfix update (ie 0.17.1 to 0.17.2). There are occasionally additional scenes added but this is usually if there was something not quite ready for release. I do believe there may be a few additional small scenes added in ver 0.17.3 if I remember the dev's last communication correctly.