suggestions: un-hold and un-halt all buttons (possibly get them from one of the starter main quests.)
magic upgrades should be toggle-able after you have 5 of them, maybe you could have to buy a magic upgrade to halt the magic upgrades of your choice.
make more games, this one is pretty fun, and you're defiantly going places if you continue down the game dev road.
change it so when you get to 1 mil instead of 1.08e or whatever just have 1m/1mil.