There will be no more free versions. When I complete the final version 1.0, it will be released here and I will update this page, so if you purchase it at whatever price now, you'll get access to that future complete version, which will cost $10.
Alternatively, you can subscribe to my patreon to follow the up to date versions. As for the current free version here, it is way bigger than most demos, has like 70% of the content of the game, so I can't realistically release any more free versions.