Board Thread:General Discussion/@comment-74.104.206.83-20130730235710/@comment-1173941-20140402164659

You've just described what a "Survival" type game is. Seeing how long you last.

Though, as you level up and go through waves, you gain more abilities and such (though, there aren't any saves, so you'll have to start over each time) It's just a way to pass time really.