Terrible. I can't see the radius of the towers, which wouldn't matter if I could see mob HP ticking down. No sound so I don't know if the towers are even hitting the mobs or not. There's no pause. I think the first $10 tower is broken, not sure because there's no sound. All around bad game. You probably shouldn't have uploaded it yet because it's clearly unfinished.
I really do like this game and I hope the bugs are worked out. Pathing is horrible and there are far too many walls and doors that look like they were just thrown in there for the sake of adding to the graphics. There are huge lag spikes around bodies, as well. It would be nice if bodies decayed quickly. And as someone else mentioned, a map is sorely needed.