Unfortunately I can't find any way to package it without access to a mac. It should still be runnable from the terminal, though that's kind of awkward.
As an example, if you extract the game folder into your home folder, then you should be able to run it by using the following command in your terminal app:
"~/The Heart's Illumination 1.1/The Heart's Illumination"
I apologize for the inconvenience.