Dang expert mode was a rush! That's where the gameplay is at and it was really a lot of fun.
Perhaps one addition could be a lower clamp to the increase to the debt. Instead of making it % the entire time. Having a $0 debt increment to $0 is really nice, but the sense of any urgency really dies down and you know you've won before you "win". So perhaps it increases by no less than $200, or depending on the difficulty
Genuinely had a lot of fun with this game though. Easy mode was a cake walk and not that engaging, but expert made me think about the best things to buy early on, and quickly switching between the gamble and bank pages to stay alive. Very well done!