An all right shooter, but not the best.
During the game, you will sabotage an enemy base, defend a Zeppelin, take down a giant walker, and drive a Quad in the snowy alpines. Normally, this would be awesome to do in a game, but Timeshift executes each of these things poorly. The AI is brain-dead, so sabotaging the base is either extremely hard or a cakewalk. Defending a Zeppelin is exciting, but most times they'll be attacking your blindspot, making it really frustrating. The vehicle controls for the Quad are broken. Driving it in FP is even more frustrating.
Wierd glitches plague the otherwise surprisingly good graphics. When you kill an enemy he goes into the rag-doll effect sadly. He might even get stuck in a wall or the floor.
The weapons of this game are its saving grace. As if inspired by Insomniac, these weapons include exploding arrows, plasma guns, lava launchers, etc.
The last thing i want to cover is the timeshift mechanics. They include slow time, stop time, or reverse time. The slow time is useful for when you need to get through a section quickly, while the stop time can save you from death. The reverse time is usually used for some of the puzzles that are included in this game. Although there are limits, for the game says that you cannot create a paradox.
All in all, a pretty average shooter with some above average weapons. This could've been an interesting shooter if the gameplay was improved and the story rampved up. Aw well, what could have been.