I am very impressed with the evolution from the original to this. It isn't just an "improved same game", its completely new while retaining similar elements.
Great technical improvements as well (I love the new graphics).
Very cool visual feel... a lot like final fantasy tactics or something... just more proportionate.
Cool game, maybe an aspect of them damaging your units could separate this from every other TD game.
Last ditch is a cool idea, but might need some more balancing.
But, this game is good as hell. Amazing technical accomplishment and very fun to play. It seems to be more of a sketch for a more complete game though (or I hope it is). Like with more maps, styles or characters.
Awesome.