Played this while i was at my gfs parents house. Best way to describe it really is "short and sweet". Great game, reminds me a lot of Timeshift just with the powers being more offensive rather than within you.
Definitely recommend getting it but you could put it off until its going cheap though. While its good there isn't a lot of replay value to it. I could see myself completing it once more on the higher difficulty but after that i dunno. There isn't a lot you can do with the weapons since the Sniper Rifle is awesome has sod all ammo, the Spikeshot is utterly useless, the Grenade Launcher is a gimmick and has no real use, the Pistol is useful for about the first 2 minutes, so basically you can use the Autocannon (once you get it about 1/2-2/3 way through) for everything because its super powerful and the Shotgun and Rifle when you feel like it.