Dang, that was quick! Thanks for the technical explanation too, that was unexpected. :)
I don't understand it completely, but it sounds like you use arrays to store numbers in order to avoid issues with big numbers?
Yes, exactly. Clickers require much larger numbers than can comfortably fit into GameMaker's variables, so all numbers and maths use arrays. In fact, a substantial part of the jam's timeframe was used to code and refine that functionality, as I hadn't done anything like that before.