Ririka von Lustveil has been updated to version 1.1.0 with a new feature:

Full Controller Support
The game is now fully playable with a controller. If your controller disconnects during gameplay, the game will automatically pause and notify you. Reconnecting your controller resumes gameplay instantly, or you can switch to keyboard and mouse.

Basic controller bindings:

• A button: Advance dialogue / Confirm
• B button: Open game menu
• D-pad / Analog stick: Navigate menus
• Right Trigger + A: Advance dialogue
• Left Trigger + Left Shoulder: Rollback
• Y button: Hide UI

If you run into any issues, please let us know in the discussions below.