A: Generally, yes. Most "unblocked" or fan-hosted WebGL versions on GitHub Pages are offered for free. However, these are often demos, older versions, or fan projects. For the complete, up-to-date experience and to support the developers, I recommend purchasing the official game.
Were you looking for a to a playable version, or are you interested in how to host your own game on GitHub? ADOFAI-gg/CourseMod: Course mod for A Dance of Fire and Ice
Here is a brief overview regarding the portable and web versions of the game: 1. Official Web Versions The developers, 7th Beat Games