I think this managed to nearly get a tear from me, the weird thing is even though I now know that this Jack is a murderer, I feel sorry and sad for him. Especially by the ending "Now I don't have somebody to tell my story to anymore"
Game Dev's should stop this concept before it gets beyond boring, simply trying to accept that you can't think of a story and saying "Yeah, okay, story whatever go kill things". Put some damn thought into it, and then I just might spend real money to further a simple flash game.
Being honest, this game is a breath of fresh air for Tower Defense games. It's not too complicated or too simple, everything looks nice and behaves nicely. It's kind of unique too.
5 stars from me.
I found an glitch, if you summon Diablo as the Win/Lose text appears at the end of a level, he will be next to the portal in whichever next level you choose, be invincible, cost no upkeep, and you can still summon a second Diablo.