I think this was a good first try at making a game! The movement could use some work, as it isn't entirely fluid and will sometimes move diagonally if I am still holding the W key and I let go of either the A or D key. A timer would have also been helpful to implement in the game so that I know how much time I have left to go out and scam people, as well as some sound cues to let me know who bought my scheme and who didn't. Some optional suggestions to think about as well is instead of leaving the selling part up to chance, maybe implement some sort of dialog system where you have to select a choice in order to convince the person to buy into your scheme, otherwise the only way to get a high score in this game is just based on pure luck.
Good job at making your first game! I hope you end up making more games in the future!