So the browser and the download versions will just be like a demo/miniature version and the steam will be a full version?
There will be at least 2 more updates on itch.io (the final one will be 0.3 I think)
The free version should have already the polish and most game elements you will find in the final version, however, the final version has an actual full story/lots of characters and just more content that you would not find in the demo version.