Update: Now that I've gotten the game, I can tell you with some certainty that the issue was the application file not being the mac equivalent to an executable and the command should be (after you've navigated to the folder containing the application file)
chmod +x /"Hamster All-Stars_v1.0.0.app"/Contents/MacOS/"Hamster All-Stars"
Note: it is quite dangerous to just run terminal commands given by random people on the internet.