My apologies, I should have made myself clearer. My point was that it isn't a great leap from what's in the readme to figuring it was the same problem with what you're describing. At least, it wasn't for me so it can't be that difficult. Sure, it's not an interaction instigated with the "E" key, but it's still interactions between the player and his surroundings.
That is true, perhaps some of the game mechanics, ive also found that sometimes the checkpoints do work and the cinematics start but no voices, a bit weird.