I looked and I exactly know what the problem is, the collision detection of the door is a bit.... wierd. so if you're to close to the door, it wont detect it.
It's probably possible to avoid this by trying to open the door with the right mouse button from further away. if that makes sense.
Next time you're live I'll be sure to be there to watch you play it live.
I'm really interested on what you'll think of the rest of the game!