I was disappointed with this game. Hard mode was anything but hard and there were a lot of graphical faults (some textures don't load correctly leaving them with extremely low resolutions). There were also quite a large amount of physics bugs, most of these occurring just after the time sphere dissipates.
Aging objects old and new was an interesting concept and nice to look at; but there was such a limited amount of items you could use it on. There were also a limited amount of weapons, varying from an incredibly useless assault rifle to an over-powerful sniper rifle. At one point during the game I couldn't even use one of my weapons to defeat the boss as it didn't cause any damage.
It was the Spikeshot, when you're on the train and you have to shoot into the bosses mouth in order to kill him. Found out that it doesn't deal damage to him after he closes his mouth even though the spikes are inside.
Most of the "puzzles" in this game were solved with fucking boxes and took less than a second to see through. Even though it had a horror feel, nothing was really scary. They should have just kept it straight-forward action without the lame ass puzzles.
The plot was interesting, the lore was interesting. Many little goodies and easter eggs. Playing with time was cool, they should have given you more abilities though.