As soon as you choose to invest in making money for how many seconds you have left the entire game loop is trivialized and you can buy all upgrades every round by just hightailing to the exit and ignoring the pickups. There was no possibility of failure when I closed the game with over $1000 on floor 46. There's some math behind making a game like this work and having scaling difficulty match well with your scaling power that I'm sure you can find some good tutorials on for next time you make a game like this one, but it's also important to make sure your mechanics and modifiers work together and complement one another rather than against each other. A modifier that gave me more cash if I managed to collect everything or gave me a lumped sum that subtracted a dollar for each upgrade left on the board would have pushed me to engage more with the core game and think about my build rather than checking out as soon as the amount of money I made outpaced the cost of new upgrades.
That said, you got me to play a game with a fundamentally broken economy for over 30 minutes because it just felt so damn juicy and satisfying to play, so big props on game feel. Keep making games!