The itch.io page isn't being updated anymore but it's still being worked on as far as i know. You can get the most recent free version on their about page on patreon (currently 0.6.1)
It is free. You don't need to subscribe to their patreon in order find the download link. Search for "Team Bieno patreon" and when you get there go to their about section and scroll down a bit to "download links". Subscribing only gives you new versions faster but it's not required to get a newer version than the one here on itch.io
Hope this helps