This makes me love Vala

delegate.vala

        this.player = new Darkcore.Sprite();
        this.player.on_key_press = ((a) => {
            // We are able to retain scope yay!
            if (this.keys.up) {
                this.player.y += 4;
            }
            if (this.keys.down) {
                this.player.y -= 4;
            }
            if (this.keys.left) {
                this.player.x -= 4;
            }
            if (this.keys.right) {
                this.player.x += 4;
            }
        });