Answer:
I am a sound made by felines when petted.
In a tunnel of darkness lies a beast or iron. It can only attack when pulled back. What is it?
I'm really blue but when you see me I'm red. You don't see me too often. I'm there for you if you're hurt.
I keep things green and keep kids happy during summer time.
The warmer I am the fresher I am.
Be sure to shout for its answers are weak, but there is no language it cannot speak.