That was really cool to watch, thanks for playing! The "yet to use" in the credits were images that I didn't get a chance to include in the game yet, not ones you missed! From the endings you saw, I think the only one you missed was "candidate" which is the most overtly horror-y ending (IMO), but one of the harder ones to get too.
I'm considering fleshing out the game a bit more in a post-release update, so that might be a good time to play again if you do decide to do a part two!