No, there's no incest slider. Patreon doesn't allow such content, so it's censored. The version offered here is uncensored, but you can revert to the censored edition if you want: Remove the incest_patch.rpyc file (if present) from the game directory and start up the game. Open the developer console and press Shift+O and type: set_special(False), the main menu label should now say Standard Edition instead of Taboo Edition.
Other than that, compared to v0.5, two new episodes have been added in v0.7.