Initially played the game without the gun since the shop is behind you and didnt see it. It costs 0 so you may aswell have it at the start.
I wasn't able to see what my money was, so it made using the shop difficult.
I'm sorry you didn't see your money, but I don't know why that was. When i tested it i had no problem with it. Your balance should be in the bottom left corner. Thanks for playing anyway
