Not clear how to:
- Find the codes for the doors
- Use the radio
- Unlock the safe
Also the easter egg didn't do anything.
Yeah, the game can be a bit obtuse. If we'd had more than a weekend to work on it, the next step would have been to make it more clear what you have to do =p.
To answer the first two points, once you've picked the radio up it's on and recieving. You need to explore the areas till you find a signal which should start giving you clues. If you move towards less static-y areas you should end up on the right track.