Community-run sites like F95zone often provide detailed changelogs for version 1.6.5a and gameplay guides.
To run the game, you must extract the contents of the .zip folder using a tool like WinRAR or 7-Zip and then run the executable file (usually InnerGrowth.exe ) found inside. InnerGrowth-1.6.5a-pc.zip
If you are looking for information on where to find the game or how to use the file: InnerGrowth-1.6.5a-pc.zip