Hey hey! Awww man, that's so fantastic! Yep, you absolutely have my permission. All I ask is that you link back to https://thunderchild15.itch.io/weird-weird-west somewhere in a description, title, tooltip, etc. (I'm not sure exactly how Let's Role works)
Small word of warning (and spoiler!) though - I am very close to releasing a new set of character sheets, with updated mechanics. So if you wanted to hold off for the new ones (maybe a week or two), you'd get the very latest versions. Otherwise, what you'll have at the minute will be out of date.
Feel free to DM me at https://twitter.com/tmcgry if you wanna discuss further, and thanks again.
EDIT: Oh, and if possible, send me a link too! I'd love to take a look! 😃