A demo version is available for download on indienova - Itch.io , with file sizes around 87 MB to 89 MB for Windows and Mac.
Depending on where you found the file, it is most often associated with: File: Heaven.Dust.zip ...
A standard playthrough takes about 3 hours , while 100% completion (including all 4 endings) takes roughly 7 hours . A demo version is available for download on indienova - Itch