瞇成線的小眼睛
瞇眼 means you squint? your eyes.... like when you have eaten something sour you squeeze your eye muscle and your eyes become smaller. Here it means the small eyes that are squinted into the shape of a line
感受周圍熱鬧生活
Yes. It means feeling the "bustling?" life around me.
這是我熟悉的世界 就算我在黑暗中
This is the world I am familiar with, even though I'm living in darkness.
熟悉 means familiar
就算 means even though