Thanks for the review! :D It's very thoughtful.
Eternal Darkness was an inspiration, even when the magic and sanity system of the game is much more simple, so no worries.
We have some ideas about expanding this concept, but I'm not sure if it will be the next project. Probably adding some "combat" so the incantations are not just to solve puzzles. But they are only ideas for now, so you won't hear from us for a while! D: