I really
enjoyed Defender's Quest in its original form, but with all the
improvements they made to the game in the Gold version (bonus battles, New Game +, enhanced
graphics, mod support), I can say that Defender's Quest is quite possibly my favorite tower defense game of all time (narrowly beating Defense Grid & Pixeljunk Monsters Deluxe).
Improvements in
graphics department are visible as soon as you play Digital Foundry's video, so you might as well
enjoy the sights while being killed over and over again in glorious 60 frames per second in our favourite masochist past time that is Dark Souls.