An error occurred on closing the game. It pointed to main script line 18, but I didn't catch what the error was because the dialog box mentioning it didn't have copy-and-paste.

The spells don't show up in the edit spell menu unless the spell screen is closed and re-opened.

The initial screen is jarring when given no context, and the paths aren't very clear. I managed to ask the info cube how to craft runes, but other than that I couldn't figure out what I was supposed to be doing. Then I got to the first battle and was informed that my spell ("cube" since that's what the info cube used) was reflected, after which I got a quick game over. I think your game could use a practice battle before that to give some indication of how the mechanics work together.