The Binding Of Isaac Antibirth
"But I don't want to go through all of those menus and folders every time I want to play Antibirth!" You don't have to! Right click isaac.ng in the Antibirth folder and make a shortcut which you can put anywhere you want, or click "Games" at the top of your Steam client, press "Add a non-Steam game to my library," find and check Antibirth (It should be near the top of the list because it is in alphabetical order,) and press "Add selected programs." Also make sure you have the right program selected, right click Antibirth in your library, then go to properties. The target should be along the lines of "steamapps\common\The Binding of Isaac Rebirth\Antibirth\isaac-ng.exe"
The Binding of Isaac Antibirth