It's a game engine that relies on HTML5 elements for rendering, audio and scripting. I don't find that misleading :)
Hypertext: is text displayed on a computer display or other electronic devices with references (hyperlinks) to other text which the reader can immediately access...
So it's a game engine that relies on something that is, according to definition a text-only language. Are you really into ASCII games? Otherwise the name is very misleading. For legacy reasons.
The real name, which is "HTML5 + JavaScript + Canvas API + WebGL API + Web Audio API + Web Workers API + jQuery (for good measure, not actually used) + CSS3 Game Engine", doesn't fit on a t-shirt and, when put in a title tag, probably crashes older browsers and causes a Google employee to come and manually set your PageRank to -1.