The Shrinking of Treehorn
Plot.
After playing a strange board game, a young boy named Treehorn mysteriously begins shrinking in size – a phenomenon which goes largely unnoticed by his parents.
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Details.
Wiki.
The Shrinking of Treehorn was a planned American animated musical film directed by Ron Howard, written by Rob Lieber, and produced by Paramount Pictures, Paramount Animation, Animal Logic and Imagine Entertainment. The film was based on the children's book of the same name by Florence Parry Heide.
The film was set to be the first animated featured directed by Howard.