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Given a key, ciphertext and alphabet, what ciphers should we be looking at?

in flag

I have the following information:

key = hellotherenhsctf - this was part one of the challenge which we managed to get
cipher text = jkwb44pg26teiu}78uu{
alphabet = vxotbj9a8yqp7n5mh1rzwcd6gfiks3uel240{}_

It's from an internal CTF at college that has been and gone but has no solves and I was wondering what it was

The final format would have been in the form: flag{xxx}. No vigenere cipher I have tried works.

The challenge text said "Yo listen up here's a story. About a little guy who lives in a green world" which a tip of the hat to "eiffel 65 - blue da ba dee" which of course pointed me to a vigenere cipher again but no luck.

Any suggestions?

mangohost

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