Love the game and looking forward to the future. One suggestion though, when you buy a ton of spawns the popup achievement windows block the cost of what you're buying. Could they appear right to left across the bottom instead of bottom to top? afaik you can click through them so it shouldn't interfere with titan purchases.
 "Death Squad"){kind=icon}
 "Idle Necromancer"){kind=icon}
 "I Am Level v1.0"){kind=icon}
 "Idle Mine"){kind=icon}
i'm currently thinking of a new popup system :)