Wow! This was hard. Needed one week to finish it :D
It was hard to find the right brainfuck algorithms.

I used this esolangs.org to help me with it.
They had algorithms where there were var-names instead of pointer movements and other algos without names.
It was hard to find a solution that works for both.
I did lset, lget and cmp completly by myself, because I couldn't find any premade solution hahahaa :D

HODOR!!! WTF!!! Really cool artpiece ;)

Okay I fixed that.
I have also noticed that my string-generator was wrong, it always generated the same string.
I fixed that too. It's my first translation between.

Yes that wrong. I will fix this. Thanks.

Cool. I really like the "registers.get" function. Great idea!

I have the same problem. This is just weird.

This is a good way to solve this.

This is brilliant. Great job. I really like the 'function-as-default-value'-part.