The broken value is actually intentional, I probably should've done more with this concept, like some cutscene or something (at first I misread "multiplier" as "multiplayer" and wondered what are u talking about xD)
ah would have been a great way to end the game, it was quite confusing what happen lol. Like imagine your number just keep getting more negative and you can buy item with negative value then your game just keep getting more broken or something.