The colors are based on HSV values, because HSL is not available in GoDot engine.Every stage has 3 levels.
I calculate the number of needed colors for the square and add extra offset of (level *2) to it.
So Stage 1 Level 1 only needs 5 colors but the 5 colors are chosen from the middle of a list of 9 colors. So color 3-7 out of a set of 9 colors.
So Stage 1 Level 3 also needs 5 colors but the 5 colors are chosen from the middle of a list of 17 colors. So color 7-11 out of a set of 17 colors.
I uploaded my preparations to my google drive if you are interested (the calculations in the sheet were still on HSV values and I somehow used a base of 256 value)
https://docs.google.com/spreadsheets/d/1MpuBHFSYP2tO1AEhOwxcaekECHVvKWqeWNCis6-i...