You can't test a theory with a single data point. There's too much randomness in what gets traction from /newest. That's why we allow reposts of stories that haven't gotten attention.
In addition to randomness, https://news.ycombinator.com/item?id=22271942 probably didn't get attention because there wasn't any context. It wasn't clear what the background to the project was, nor what was interesting or different about it. You did later post a comment explaining that a bit, but the comment was so unpleasant and bilious that it came across as trying to bully the reader into liking the post. You're not going to catch many flies that way! You also posted the comment a couple hours after submitting the article, by which time it would have fallen off the /newest page.
There's another factor which is actually a little interesting. More polished projects often do worse on HN because readers assume that they're being posted by companies for promotional reasons, and people find that boring. Since there really are a lot of such promotional submissions, it's understandable that readers pattern-match that way. More amateurish projects have an advantage here: they're more likely to be judged as authentic, which is intrinsically interesting. It's a lot more satisfying to relate to other humans and their work than to encounter a corporate facade. Especially for a project like a game, an HN thread is usually only very interesting if the creator is present.
Of course there's nothing wrong with professional, well-wrought work! The solution here is to add a comment to the thread giving the backstory of the project, and explaining what's different about it. That does two things: it gives people an explicit starting point to kick off from, but also it implicitly helps classify why the thing was posted. Titles make a big difference too, since that's your first and best chance to interest the reader.
Most importantly, that does look like a great project! We're always on the lookout for good submissions that fell through the cracks, and we often invite reposts. I'd be happy to do that with this one. If you want to, please email hn@ycombinator.com and we'll figure it out. But it would definitely be much better if one or both of the creators themselves were around to engage with readers—that would make the thread more alive. Assuming that the game is as you describe it, I think the community here would have a lot of fun with that, and your bored teenagers might get some good validation to keep creating.