exponential growth does it, you need mathing that handles bigger numbers better.
N^28 is just built to be explosive
Definitely, there was one point when I tested early on where once you unlocked the mult upgrade at 10k cash you could end up getting to the e350+ range within a round or 2. It was the first time I noticed the crashing there but I ended up focusing on trying to balance it some instead of fixing the crashing.
I had a hard time picking how to balance because I wanted fast number growth, just without it running away to where you can't spend all your money like what currently happens.