The Gosu team is happy to announce that our Gosu plugin supports IntelliJ 15. Install it this new 4.1.0.0 version:

1. With IntelliJ running, open the Settings menu and select Plugins
2. Click the Browse Repositories… button, and search for Gosu
3. Right click on the OS Gosu and select Download and Install
4. After the plugin has been installed, restart IntelliJ