User blog comment:Flockky II/Flockky's "Lucky Lock Flock" Level Design Contest/@comment-24047760-20141209004641

LOL

A new key is available every 5 moves (30, 25, 20, 15, 10)

Difficulty: I'd have to go with Very Easy XD

I could be wrong though. I'm not very good at rating my own levels :S