Nice game, nice story! I'm 34, so film photos were a big part of my childhood. If I could add one thing to it would be a progress bar to indicate, well, the progress of the actions like pouring the developer/fixer and rinsing. Good job!
Thanks for the feedback! You're right—the hint system in our game is a bit unpolished; I didn't have time to fully refine it, so in some places it might not be clear whether to press or hold a key, or for how long.