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That took me to the German version, you can get to the English version (which is at the same url) through this page: http://wwwlgis.informatik.uni-kl.de/cms/courses/informations...

There's also Schemaverse https://schemaverse.com/

I've never played it but it looks interesting.

Is there by any chance an English version available?

Mh on my settings it was english by default. With this parameter it should work: http://wwwlgis.informatik.uni-kl.de/extra/game/?lang=en

Weird. It did not want to be in English for me on Chrome or IE. Thanks for the link.