BHG, please change the color of the new level 17 walls. I’m partially colorblind so it will be a nightmare trying to upgrade my walls. Hell, even those not color blind will have issues.
While I agree that the new level of walls look hardly any different than 16, I don’t think you change the color until Space Age walls become available. Which hopefully isn’t far away.
TBH I think level 16 walls should be changed, too. They're barely discernible from level 15 already. Making level 17 follow the same pattern is a mistake IMO.
At least 15 and 16 were clearly differentiated by shape. These ones can't be told apart without zooming in a bit. They are obvious once zoomed in (sharp edged circle instead of fuzzy), but not from a high level view.