Hi, thanks for playing! Glad you enjoyed it and noticed some much stuff! The rune guide being the actual game is spot on :)
I hadn't noticed what you said about the arrow looking like a "greater than", it makes a lot of sense actually. Having a better arrow could also help other people to understand the game better. I'll take that into account in a future update.
Also, people clicking random buttons until it works has been a recurring situation with other players hahaha
I'm still thinking on how to solve this. Maybe a harder puzzle, or one with more steps, or allow the user to insert only 4 symbols at a time... well, I got some time to think on this.
Once again, thanks a lot for taking the time to play and leave a comment, I really appreciate it. Cheers!