TowerFall Ascension provides the ability to display proper button icons for recognized controller hardware. The following files will be found in the same location as the save data, and can be edited by the user.
Use this file to map a button list name to a series of sprites that will be used for the button icons. For example, the name "XB360" is bound to the icons in "xb360/" within the game's texture atlas. The list name can be whatever you like, as you will be using this in the next file.
Use this file to map a GUID to a button list name from the previous file and a readable controller name, which will be displayed at the character select screen. For the GUID, refer to the docs at Engine:FNA#About GUIDs.
TowerFall for Linux supports the DualShock 4 light bar. The light bar will sync with the player's current archer color.
To access this feature, refer to the FNA user documentation.