Oh I absolutely love this, and not just because Rats, though that helps a lot. I definitely look forward to seeing whatever the ending is!!
I think I have encountered some bugs though, namely that I seem to be able to order any of the vending machine items right from the start, even though they don't show up, putting their number into the vending machine still allows me to buy them.
I also think there could be some improvements? (Maybe the upgrade for inputting max cash at once could just be to click the item from the vending machine to auto-buy it, typing in the numbers still gets super tedious really fast even with the upgrade,) But it's also nearly 1am now and i need to go to bed lol