MacOS 10.13.2 (High Sierra). It's an Irish keyboard, so it is still QWERTY and all that, but I could switch to a different layout and try again if you think that would help?
Ehhh.... I tried it again without making any changes and it worked fine! I got one of the eyes to light up!
It's anybody's guess. I developed and tested it on a Macbook with 10.11 so I'm not sure why there would be an input problem. Still, there are probably better games here for you to spend your time on.