Thanks you, looks like we both made a game that's a perfect fit for mobile then :D
The training cost is the biggest piece of feedback I've had that will definitely be step one when it comes to updating it. As for the game over thing that may have just been poor timing. It does/should pause the game but arrows do slowly reduce the population if they hit the castle too. I'll look into it to make sure it's not a bug, just in case.
Thanks for checking it out!