My SMITHY OF SACRILEGE and QUARREL + FABLE each use D6s alone and both operate under a CC BY 4.0 license so feel free to take a look at them!
https://seanfsmith.itch.io/puffin/download/jgDRA4Ch9FijbZuVbxtP0bktS3tHbUSly92QxUQZ
https://seanfsmith.itch.io/qf-postcard/download/t_PP_ERr8cN_3fnP61FxVZpJ4GGF9Cp4BfUDb6_4
These link to comp copies