Hi, it’s mentioned in the description: you need to press the "1" key to take out a dollar and then throw it into the hole using "Left Click." That dollar you threw is now at the cyan-colored shop; "Right Click" on the shop, then select "Buy," then "Investment Hole," and purchase the money machine. "Right Click" the money machine's red button to spawn dollars that you can throw into the hole to earn more money, unlock better ways to make money, and upgrade the ones you already have. Sorry for not clarifying this within the game itself; it’s my first Game Jam, and I didn't have enough time to create a tutorial or anything like that. By the way, I recommend not upgrading the money machine until you have 225 dollars; otherwise, it will take you longer to play through the game.
