I use Chrome on the Mac to use the customisation features. It seems to work fine, there are a couple of issues.
It is forgiving (likely a good thing though), if you accidentally enter two commas in a point array between two values or an extra comma at the end, OpenSCAD is smart enough to process it and work out what you likely meant, MW version isn’t. I wonder if this is due to BL running the command line variant of OpenSCAD which may not have the forgiveness.
Variable names with an underscore in the parameters section should swap the underscore to a space in the UI, MW version doesn’t. It is a feature that allows presentational names in-place of actual variables. It presents a better experience for the user. We don’t have that on MW.
We are constantly removing ineligible models from the contest page, it may take some time for this action to reflect on the model number. Please report any entries you believe that is irrelevant to the contest theme, thanks!