The unity version of night of doom can be player at:
http://www.kongregate.com/games/Kaos_nyrb/night-of-doom/ 

 The unity version of Night of Doom uses the same assets as Night of Doom 2, however the game play has been redesigned to give it a more online flash game feel.
Waves of zombies now spawn and killing them rewards money that can be used to upgrade your weapons and stats.
Using the unity engine was a lot different from programming the Xna version, most of the programming was Gui and game play and very little engine work.
  

 
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