Music
agree on a volume slider idea and i had minor stutters and cracking with music too without any huge loss on fps. not sure why.
Mana
i found the income speed well balanced. income was too fast with the previous builds. you could spam thousands of imps and research 3, 4 spells at the same time in a minute or so but this one was just fine. you have to wait a little and keep the number imps low & save some mana for research, allowing the player to see the research being used step by step
in fact i was even going to suggest adding a mana storage limit and a room to store mana. (like you have to pay mana to build a room to increase the max mana amount – not income speed) but not sure if its a good idea if many people find the income speed to low like tchey did
