My friend Venus wants me to comment "the cipher also says something about red to green, but part of it is garbled"
i personally was unaware of base 64 in my list of gravity falls inspired ciphers, but looking it up, I thiiiink it's "initialize red to green color vision"???
Edit**: YES INITIALIZE... those were lowercase l's the whole time!
full text is: SU5JVElBTElaRSBSRUQgVE8gR1JFRU4gQ09MT1IgVklTSU9O