SteamDatabase/SteamLinux — pull request #171 by ToostInc (2014-06-25 20:51:58+00:00)
Title: Added Heroes Rise: The Prodigy & Heroes Rise: The Hero Project

Both don't have Fullscreen or Steam overlay, but not sure whether this
is a bug or if it is intended.

Also added this as a comment, linking to a relevant Steam discussion,
where I hope to get some answers.