Great game, but there was a bug where tommy came in. I guess I took too long restocking and 2 Tommy's (shirtless dude) came in and were in the store at the same time. The problem with this was they were pushing eachother and glitching- I could ask both of them questions. I checked the first ones items out (It played his dialogue about his sister) and shot the second one.
Another bug I experienced was when the creature comes in at the end. Clyde came in first, but while I was talking to him the creature also came in and stood infront of him (pushed him). There was still Clyde's card on the table and i had not finished his dialogue (and Clyde was still answering my questions). I ended up just completing the transaction causing the creature to walk off (Clyde still in store). Only then did it say that I let one doppelganger through (not sure if that was to do with the tommy situation) and the entity came.
Other than that, it was a great game, and I enjoyed playing it! I have seen many people complete this game no problem so perhaps it's just me.