Swtyblz Encodes Instant

If I assume that each letter is shifted by a certain number of places, I can try to decode it.

Now if "swtyblz" encodes: give me a feature swtyblz encodes

Hmmm...

then

Was that what you were looking for?

Could you give me a hint or tell me what kind of cipher "swtyblz" uses? If I assume that each letter is shifted