Hello sir I just want to report what i encountered. I have exactly 3 knowledge (280 mana) and when i want to cast spell "deep cut" which costs also 280 mana - i get error saying that i cannot cast generic spell due to some value beign 10 instead of 11..
But anyway - you have makings of very good and fun game here ! Watch chineese anime "The richest man in game" and try to do their business model and im sure it will be a great hit ! :D Keep it going ! :)