[Someone]

Not there at all (slower than the Pascal equivalent, limited to fairly simple games, and uses some C), but nevertheless interesting is http://cleangl.sourceforge.net/thesis/CGL.pdf, which describes a game library in Concurrent Clean.

(reading http://clean.cs.ru.nl and looking at the archives of the mailing list may give the impression the project died at the end of 2011, but http://clean.cs.ru.nl/Download_Clean has binaries from November 2014)