Just in case you (and others) are not aware, this started as a free Flash game. The Flash version is still available and was up-to-date last I played either. I'm not sure if it still is, but it certainly has the vast majority of the content in the Steam/iOS/Android versions. If nothing else it'll be a good way to decide if you want to buy.
You can play it here: http://armorgames.co...41/kingdom-rush
Wow. Thanks bro.