Maybe I’m doing something wrong, but I only have some money at the very beginning. After that, I lose more each wave than I can earn. From the very start, I time travel, earn $5 from the first client, and play at the slot machine. I take the key. Then I time travel again. I open the slot machine with the key. From the next client, I earn another $5, and I have $10, but I can’t play at the slot machine anymore, as you mention in the description. I even had $12, but I couldn’t do that. After that, all my money just goes into the negative. Also, when the wave reaches 10-12, the game starts to lag significantly, probably because there are too many clients.