Interacting with your fans is important component to building and marketting a successful project. itch.io lets you do that in several different ways.
If you have a page for sale, you can send an email to all your buyers via itch.io. Do so via the Interact tab, in the email section. You can include the buyer’s purchase URL at the bottom of any email you send to make sure they can easily access any files you may have updated.
There are a couple things to keep in mind:
From the Edit project page, you can enable comments. Anyone with an itch.io account will be able to participate to the discussion.
Comments are threaded and can be voted upon – you can pick from ‘upvotes only’, ‘up & down votes’, and ‘no voting at all’ from the Comments tab
If a comment thread doesn’t fit your needs you can also enable an entire message board for your project’s page. On the Edit project page, directly below the option for comments, you'll find the option to enable a discussion board. A discussio board contains all the features of any community on itch.io: full control over the content posted along with the ability elect moderators, stick topics, and set rules.
From the Interact tab of the Edit project page, you can see a list of ratings left by your fans. You can sort them by date and score.
Next to ratings, you can see Press links added by press accounts on itch.io. Feel free to pick two or three of those to quote and link to from your project’s page.