Unity of the Elements

Regarding the videos, they are not yet fully polished. This can be fixed.
To understand the map's content, you need to read all the messages carefully. Then it will be clear why a titan appeared instead of an angel.
They are scared - there is a hint that something can help them - this is understandable.
The key to the library - if you read the signs, it will be clear where it is. Remember games with loot collection - it's not always clear at first ;)

Added 6 minutes later
As for visual bugs, such as passing "through" the gate, I couldn't do anything about it, only remove that part of the model.