How to add both options like Enter or Mobile touch to start
this.enter = this.input.keyboard.addKey(Phaser.Input.Keyboard.KeyCodes.ENTER);
Or
this.enter = this.input.on('pointerdown', this);
Depending on what you want the result to be, you could:
create one function, that handles both events:
function doAction(){
alert('action')
}
and then reference the same function in the event listeners, of both actions:
this.enter = this.input.keyboard.addKey(Phaser.Input.Keyboard.KeyCodes.ENTER);
this.enter.on('down', doAction);
// ... AND
this.input.on('pointerdown', doAction);
Update:
If you want to, check what device type the app is being run, you could use the information of this.sys.game.device.os
(link to documenation )