Thank you for playing it, I guessed that it would be a problem. I need to make a bigger gap for pressing a rune, because mouse has big latency issue. It also could be graphics which causes latency issues. I'm going to remake this mechanics in Unity or Godot next time, so possibly it will work better. And yes spells needs a tutorial or reminder in inventory. For now it just shown once and even if tutorial is occasionally would be closed you can't figured it out.