Maybe a bug? It showed the whole screen for me! :/

Did you try to zoom out? The hyphen button should move the view back so you can see more.

I tried to zoom out. Didn't work :(

Here's a trick: jump on the screen. That last screen has a platform; also: that is a working vendor (jump up and click on him, and he'll show you that he is selling everything that a normal Toy Vendor does). I hope this reply helped you!
-ettu