the idea of levels with increasing numbers is interesting could work to give the players a break from time to time (maybe they could see a graph of how their money went up or down over time, sort of like an investment stock over time),
you could just have it be that the more things the player hits the more money it loses them? like first 10 then 20. could be that your like credit rating or insurance premiums are going up making each subsequent hit cost you more, might not be totally clear to the player could be explained or having the text size increase as the amount increases, which could be used on money as well I wasn't sure now that I think about it if orange or green dollar signs were more my instinct is green but idk