Looks fantastic and is fun - I can see what you were going for with the risk/reward of paying for more dice to try and get a higher roll; it's a great idea.
I know time's always tight but it would have been nice to see at least one other type of 'tower' available (though, due to the nature of it, I get that it'd be hard to pick which one as you might still not get it!) but, despite that, still a good entry :)