I'll have an update soon to fix our sound library that apple is blocking on macOS 10.15. For now you can use this method to get rid of the error and run the game on macOS.  https://osxdaily.com/2019/02/13/fix-app-damaged-cant-be-opened-trash-error-mac/ open terminal and go to cd /Applications, then type xattr -cr “Octodad Dadliest Catch.app” 

or follow this video:

https://www.youtube.com/watch?v=6fqzb4qpgcs&feature=youtu.be