Maybe they work with Androids or enjoy coding for Androids or don't know how to do it on the web or any one of a myriad of reasons?

This isn't a very relevant or constructive comment. It's just saying "why didn't you build something completely different," which, I think, is sort of condescending/non-productive.

I've built something like this with web tech before [1]. Unless your commands are going to the internet, and not through something like bluetooth or wifi, you need to do it with native.

[1] https://github.com/reustle/meteorgame

Yeah but then you'd have to maintain some software built on web tech.