It is possible to crash the generator, so that it will only show the blank background of the last used colour. You can only see the fullscreen button, which is working, but clicking anywhere else or trying to use keyboard to generate a city proves innefective.
It most likely occurs, when you click on a link on the page (i.e. the itch.io links on the right side of the page) and redirect yourself from it, you try to go back and you realise that the generator doesn't work.
The bug seems to be independent of the browser you use, it happened to me with Mozilla Firefox and Microsoft Edge. Refreshing the page, restarting the browser and deleting the itch.io cookies don't help. If anything changes, i will update.
I hope the bug will be found and eliminated soon, if anybody knows a solution, please share. Thank you!
EDIT: Restarting the computer didn't help either. Other creations are not influenced and i could not crash them this way.