Fanmade game client of "A Dance of Fire and Ice".
Some resources(samples) in this game are using ppy/osu-resources.
Circle's code and framework are licensed under the MIT licence. Please see the licence file for more information. tl;dr you can do whatever you want as long as you include the original copyright and license notice in any copy of the software/source.
Please also note that some game resources(samples) are covered by a separate licence. Please see the ppy/osu-resources repository for clarifications.