The itch.io desktop’s application (Linux client) landed in SparkyLinux repository.

itch.io is a website for users to host, sell and download indie video games.
Indie game (Independent video games) are video games created by individuals or small teams generally without video game publisher financial support.

The itch.io desktop application can be installed via the package manager:
sudo apt-get update
sudo apt-get install itch

or via Sparky APTus Gamer => 0.1.11

Itch client