Thank you for playing the game!
I watched your playthrough on YouTube. Here are things I would like to share with you:
1) I apologize for the camera clipping issue as I didn't have time to fix it.
2) As for the door which requires the key to unlock it, there is an unexpected bug that actually you don't need to interact the door before you search the key. Meaning, once you got the key, you can just directly get in after you interact it.
3) "Point the light at them" issue: The light only disables the invisibility of "it". It doesn't do something like destroying "it", nor make it disappear.
4) You are so close to clear the game in your first try.
Overall, I appreciate that your spend your time for playing the game, as well as your comment and thought, and I will take into account for the next game design/development.