Today's update adds a hidden setting that causes alt-click to be interpreted as a right-click. It is off by default.
Opus Magnum update for 7 January 2019
UPDATE: Small accessibility feature
Wendy
Patchnotes via Steam Community
Opus Magnum (Windows)
Depot 558991
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Opus Magnum (Mac)
Depot 558992
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Opus Magnum (Linux)
Depot 558993
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Changed files in this update