Finally, an addition to the Sift Heads series! And my first review for the new Newgrounds design!
Anyways...
I can see that you are playing with a new environment rather than the standard first-person shooter type. The only problem I have is that since it's 3D, you can walk behind buildings, and in most games the building will become transparent when you walk behind them; however, in this game it doesn't, thus you can't see yourself and get confused or frustrated (Especially when there are people attacking you). So you should make it that way. Naturally in a 3D game, players will often feel lost and unsure of where to go or what to do. Adding a mini-map will solve this problem.
Also in the line of criticism is the fact that you can't restore health in the game. For a short game, it's alright, but you should clearly mark where you can restore health, to prepare users for the upcoming multiplayer and let them know, "Oh, I have to go here to do this, and go here to do that." And last (But not least), this game was too short, and has a cliffhanger ending. We can only hope that the multiplayer will release soon, because cliffhangers drive fans crazy.
-Pros-
-Excellent graphics (Well drawn indeed)
-Good storyline
-Little lag
-Good sound effects
-Epic music
-Cons-
-"Pyrozen" intro has no instructions, confusing people on what to do (For confused players, just click on the screen)
-"Press Space Bar to Skip Cut-scenes" information not given to player early enough (Some people hate intro cut-scenes)
-Buildings don't become transparent when you walk behind them
-No mini-map
-No way to restore health (Except by dying)
-Too short
-Neutral-
-Cliffhanger ending
-No cheats
My rating: 3.5 Stars
I look forward to seeing more!