This was a pretty poor attempt at a detective game, although the idea wasn't completely terrible, there were more than a few flaws that caused it's downfall.
Ultimately most of the rooms in the house were completely pointless, and some leaps in logic were made. How is there tape on a hidden murder scene that you haven't been told about? Why did they keep the child and not the mother? If no evidence was removed from the house can't they just check who had the gun? What the fuck did Bill use to escape? All these things contribute to a rather poor detective game. Not to mention the small amount of space you need to hover over something for it actually to be inspected.