Here is just what I suggest

1. The stairs are a little hard to walk on, maybe add a invisible ramp on the stairs to make them easier to walk on?

2. (For the funnyzz) Make it so that if you put a master card, it says "Slot machine not suitable for Bank Cards"

3. (Another for the funnyzz) If you put a playing card in the slot machine, it would come back as shredded paper.

4. 106 old spawn sound please. (It makes such a tense mood)

Thats all