This is a interesting and unique artistic game, I am having fun! The art and music are very nice, they really adds to the feel of the game. The flying controls are quite fun, and the creation of the conjuring circles themself is quite beautiful to look at.
And then there are some nitpicks I would like to address as well. Firstly, although the tree looks nice, it is really hard to fly through, and somehow some branches can be directly flown through. I am not sure if this is intentional or not, but if yes, then probably add some visual indicator that is can be done so. Secondly, the runes are quite difficult to see if they are in front of some light background, especially near the top of the screen. Maybe change the graphics a bit, or make it more substantial in the scene? Lastly it would be nice if I can undo runes by right clicks. Moving the mouse down and press there is kinda annoying.
But anyway, it was not a bad game by any means. Well done!