Kyle over at JayIsGames (http://jayisgames.com/archives/2008/12/eternal_red.php) sums up this great hybrid tower defense/shooter game well:
While I'm not the world's biggest fan of either strategic defense games or platform shooters, Eternal Red just seems to work so well that it quickly becomes a difficult game to put down. Instantly it grabs you with its simple yet dark and foreboding artistry: everything save the moon in the backdrop is done in black shapes outlined with red, and these wonderfully morose visuals are backed up with a macabre kind of techno soundtrack that manages to combine the oppressive mood of the setting with the intensity of the action. And that action is quite awesome.
http://armorgames.com/play/2818/eternal-red
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(http://armorgames.com/play/2818/eternal-red)
from http://jayisgames.com/archives/2008/12/eternal_red.php