(spoiler obviously)
That's a thing for the "massacre ending"/ path E, since Dave died, he doesn't appear on the title screen, just start again and he will appear.
Just by reading i already love the concept! Really looking forqard to! But... i am an android user and since the game does not have an Android version it will be hard you know? So could you possible make an Android version? Not just for me but for the Android usar too! Would be thankful, and keep doing the great work!