Very cool game! I like how the difficulty curve progresses slowly, but surely. By the time my run ended, the game was already relentless!
I liked the artsyle very much, and the music too. It was a great call to keep the bills simple, but giving you little time to decide if they were real or not. It allows for a faster-paced gameplay.
Also, somehow I really ended up feeling like an expert in detecting counterfeit, similar to what happened to me with another game on this jam. I really think it's an accomplishment when you can make the player feel like they're actually experts at a certain game mechanic. My congratulations to both of you!