Remote Gamepad by SmartFusionLabs was released on Steam with native support for SteamOS and Linux.
The tool turns your phone into a gamepad for the PC: it connects over Wi-Fi or USB, acts as a steering wheel via the phone’s motion sensor in racing games, and forwards button presses from controllers connected to the phone.
An included layout editor lets you build your own controller layouts with adjustable button position, size, colour and shape; layouts can be shared with others via a link. The app works with any game that supports standard controllers.
At launch, Remote Gamepad costs €1.89 instead of €3.15 (40% off until September 15, 2026).
Play games on your PC using your phone as a game controller. Rotate your phone as the steering wheel in racing games. On-screen controls are available similar to a game controller.
This app is compatible with all PC games which support game controllers. Use Wi-Fi or USB for the connection.
Button presses on game controllers connected to your phone are forwarded. This allows you to use mobile game controllers with your PC.
The included layout editor allows you to create and use your own controller layouts. You can customise the button position, size, colour, shape, and more. Layouts can be shared with other users using a link.

Source: Steam