Okay, I clearly didn't get all the cards 13/20. And if I thought C-2 was hard, C-8 was monstrous! I can get around the room from the left and below, but still can't open the yellow door in that room to get out the top, or get the card, all due to the lasers. And, I can't unscramble what the others are saying, or open the red door at the end. Though I haven't been able to get the lantern, or anything else for that matter, to the end. But I've carried it around a lot! Wow this is tough!
Yeah C-2 is really hard! I could have handle better the difficulty ramp in that area.. Sorry about that.
C-8 is a bonus room, these are significantly harder :) I suggest you ignore the card and focus on reaching the next room first. Once you reach B8, you can focus on the card in C8 then (and you should respawn from the top).
The red cube is the ultimate challenge of the game. It’s like a permadeath mode.
For the npc dialogs, these are revealed by collecting the memory cards.
Thank you for your feedback, I’m glad you finished the main rooms despite the difficulty.