Kinda minor but these guys can spawn in the edges of the screens:
The quest icon also looks a bit off the way it is now. Moving it one pixel to the right so white borders the entire thing may look better.
EDIT: With the quest icon, maybe just inverting the colors may look better? Switch the black to white and the white to black.
The wallwalking issue is fixed in the current build.
As for the quest icon, sadly it's an odd number of pixels, so it's going to be off center either way.
Macman: Did you find the other entrance? Go explore the southern beaches of the overworld.