Well, it's quite cool, but if PDF supports javascript, putting a javascript game in a PDF is something obviously possible. I don't know if it qualifies as genius. If the game was made from PostScript commands somehow, that would be genius.
Anyway, I love this content on Hacker news, as opposed to people explaining how they want Apple to take their freedom away, because freedom is dangerous.
I don't know how serious you are, but for others projects like this are virtually never a waste of time. There's opportunity cost of course, but that's very difficult to measure. I'm sure OP learned a ton about PDFs in the process, and there is/are no shortage of needs for PDF creation. More broadly they also deepened their knowledge of javascript and other things.
