Hi! Thanks for playing and for your feedback with particular numbers :)
I will definitely check it again. From code perspective and my testing, looks correct.. but your case is indeed broken, both ant and turtle should never be that expensive with just 42 buildings. I have got 25 turtles now and the new one is only ~160k. There is a total price increase mechanics in game (ie you buy turtles but ants also get more expensive) but well not that crazy :D
Will check it