a couple more errors -
i was able to use the encyclopedia despite not picking it up
if you walk left to the screen with the elders after maria starts following you, there will be two marias on the screen when you return to where you find her. speaking to her again will cause the duplicate maria to disappear though, so it doesn't prevent you from finishing the game
also, with maria, you are able to walk on the wall with the window, which you aren't able to do without her
i like that i've gotten the 'true ending' end card several times despite taking several different paths to get to it (ive gotten it with and without killing, with or without forgiveness, its cool they are able to get the same result)
i have now been able to get all endings: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 (the error i mentioned previously occurs after you tell your father you hate him before entering the feeding room, and you did pick up the gun but i was able to get the ending without issue in the alternate path where you are offered the deal)
(also idk if i expressed just how much i love this game in my previous comment its just so good!! since there's no sound/music i picked a random album to listen to while playing and lookingafter by vashti bunyan and it was coincidentally like the perfect mood and tone for several parts in the story. the path i took on my blind playthough was the most rewarding and satisfying, the gradual discoveries you make in the story is perfectly paced. it was a bit slow trying to figure out what triggered the different endings but i did enjoy finding differences in the paths i could have taken. im really impressed this is your first game because its one of the most interesting and engaging story game ive ever played!)