A really cool project! I had a similar idea a few years back but eventually had to scale it down due to issues I encountered with "seeding" the generated pattern from user input and overall convergence issues.
Here is hoping you manage to find the time to improve it as you wanted, having this tool around to play with would be helpful when trying out WFC for the first time :-)
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Thank you so much for playing! I’m really glad you liked it; this was definitely motivated more by ‘I know I want this to exist’ rather than any sense of whether it would find any audience, so, deeply gratifying to have found one!
Really hope I can find the time soon (not an easy task as this rather late response indicates) to improve it, yeah - the idea of it helping someone to experiment with what’s possible with WFC is definitely the goal!