I really like the level, except the same problem as @gmacpro. I found it by the 3D editor, and it's not only hidden, but also requires a special move to activate. If that part were somewhat visible, I'd be a 5 star level to me.
Indeed hidden... And an in-level hint would have been better but rather due to nice gameplay let's make it 4.5 stars
Yes sir,yes sir!! Amazing tricky level....buff,really challenging to find the path!! I enjoyed a lot!! As usual excellent job and thanks for sharing @yuan