The box broke when the slime was talked to after interacting with the box. It was impossible to input the code the slime said. Cool premise for sure.
Viewing post in CoG Adventure jam comments
THIS IS NOT A MISTAKE, THIS IS A CODE, EACH NUMBER OF WHICH IS THE ORDINAL NUMBER OF A LETTER OF THE ENGLISH ALPHABET, there is a hint there, a little further on, apparently I did not take into account that it would not be too clear, sorry for that
PS: I also want to say that if you can't enter the code, then you need to click on it with the mouse