It crashes because of another reason... most values are set as an integer, a 32bit-integer... which can't count further than 2^31 ( = 2,147,483,648 ).
If the value of Bonus-blocks or the costs of upgrades exceeds 2^31, Unity gets "dumb" and stops working ^-^
Dev is working on it ;-)
Join the Discord ( https://discord.com/invite/jwrF6TdBSn ) to get any updates.
INT-bug-fix may get released today ( if it's Monday in your region ^-^ )