I've played the demo, and I liked it, here are some bugs I have found:
1. The lab assistant in Olivine (when you get there) says Thankyou (instead of Thank you)
2. He gives you 5 pokeballs, one by one.
3. No sure if this is a bug or not, but over the boulder (in front of the lighthouse in Olivine) it says Don Pat (I'm guessing, it's because you used the new tileset).
4. The Trainer card has a girls picture (I choosed the male caracter)
5. When you try to enter the dock (in Olivine, and you have talked to him first) the salesman doesn't turn to you.
6. When you talk to the salesman in the Valencia mart you get this error:
Undefinded local variable or method 'vall_shop'
And a suggestion or two:
1. Use proper door animations.
2. Give the maps bigger borders, that way you will get a better feel of "never ending" maps.