New update adds custom music support, the option to rebind all keys at once and the option to use a joystick hat switch!
To use your own music for the game's music player:
1) Right click on the game and go to "Manage" -> Browse Local Files.
2) Navigate to Exosky Demo\Exosky_Data\StreamingAssets
3) Right click and create a new folder, call it "Music".
4) Drop in any MP3s or WAV files you'd like.
5) In the audio options in-game, enable the custom music option!