Is there any way I can have a tunnel effect like this one in Super Castlevania IV?
I searched for some layers effects, but none of them gave me a similar perspective.
The most similar one was the “Bulge Pinch”, but I didn’t find a way to make it pinch in a line.
Try the Displacement filter with an adequate texture.
You can create your own displacement map in GIMP with the gradient tool.
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So I make a gradient like this?
And the values I just… 0 and 20? I didn’t quite understood how it works.
Yes, a gradient like this.
I don’t have much experience with the filter, you’ll have to use trial and error. 
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