Thanks for such detailed comment! You really did dig into the game and pointed out some pain points.
The system you were playing is being heavily reworked ATM, so pretty much every problem you mentioned is gone. Though I'm interested: did you finish all the waves? As far as I know (as a game designer) there is only one combo of runes that can lead you to the final wave. Did you find it?
We really hope you will be there to check out out next big iteration of the game when it's going live. Again, thank you so much for you time and passion !