It’s weird, but I think you’re both right. My first reaction to anything html/javascript/etc is a mix of “ew” and “that’s not very impressive“. But I also think it’s important to be inclusive and flexible. Society’s best off when people fight past their internal prejudices, but my past experiences with html/JavaScript put a bad memory in my mind.

Ultimately, this looks like a well executed program from the screenshots. I say kudos to the developer of it. They did something productive and made something useful.