Thank you so much for playing my game!
About the epic level 7 situation - there's actually a small chance of upgrade failure and money deduction at higher levels, it's part of the game mechanics.
I can imagine your unique sphere situation - it's kind of funny but also makes me sad thinking about it 😅
I'll definitely consider adding some safeguards in future updates!
Lastly, I really appreciate your detailed feedback and I'm so happy that you enjoyed the game - it makes my day! Keep having fun! 😊