If you updated your iPad to the new operating system recently (version 13.1.2) you may experience a few issues playing the games using the Safari browser. But this is easily and quickly fixed in one of two ways.
1. Simple Settings Change
Open Settings on your iPad and select: Safari > Request Desktop Website. Under the ‘Request Desktop Website On’ section, click ‘All Websites’ to turn off/grey out the toggle.
2. Chrome Browser
OR alternatively use the Chrome web browser on your iPad.
If you have any questions please feel free to contact me. The creators of the software I use to make the games are aware of this issue and are working to fix it.