Nice little game, but it got a bit repetitive once i was just looking for a few letters, then just the gravestone. And i didn't see any hints to the number 2, so if somebody's not heard the phrase "ashes to ashes" before, they might not get it.
If i were to recommend how to fix those few problems, you could:
1: weight the randomness so that it tries to show them all the same number of times (like how most music apps don't give you the same song until all the others play, maybe something like that, excluding the gravestone scene)
2: Add a scene that gives you the number 2 (unless there already is one and i got really unlucky)
3: Once you see both the password hint and the gravestone, add a small gravestone button in a corner that takes you to the gravestone scene
4: Not really solving a previously stated problem, but having the option to view all the scenes in order once you enter the password could be nice
Overall, good little game, solid 7.5/10