The developer's names are on the back of the barn door. Normally you can't see them when you close the barn doors from the outside, but if you are inside the barn and close the door, you will see them on the back.
The text is:
"Designer/Programmer: Alex Harris
Audio: F. R. Ack
Graphics: F. R. Ack"
It corresponds to the credits information on the box of the game.