A very nice game, has its style and feel. Personally I feel like there's too little gameplay but for a first game it's plenty. Also a quick tip, do try to look into godot's project setting's viewport stretch mode, as I guess you've made the game with default settings, making the gameplay area not stretch but expand, leaving gray strips of godot's default background. (This setting can be found: Project -> Project Settings -> Display -> Window -> Stretch -> Mode)