Hey! Thank you so much for checking out the tool!
This was our first attempt at implementing wave function collapse. I agree that some instructions would be great to add and we hope to add that and some more functionality in the future.
We used olc Pixel Game engine, a one header file game framework. Made by a guy on YouTube by the channel name Javidx9. He has a lot of great videos on c++ which is what we coded this tool with.