You have quite a bit of stage that you aren't using.
First of all these:
boundleft = -150
boundright = 150Actually reach to:
boundleft = -190
oundright = 190However, you should note that changing those values reveals another problem.
Floating Juggy sees a stray black pixel to fix.
---
Then you have the vertical parts.
boundhigh = -137Actually goes to
boundhigh = -138 
But then there's the issue of the unused sprites below the stage also.
Changing boundlow to 34 reveals that you have some part of the railing sprite we don't see.
If this part was never intended to be seen, you may as well edit it out of the sprite to make it smaller.
Also seen here (shown by the red and pink arrows) is the fact that you have both shadow an reflection running at the same time. You should pick one and get rid of the other. While, like in FlameKyo's stages, it may be hard to just notice offhand due to your fog layer, you can still see it.
And finally look at the green circle. If you wanted to add a simple animation to the stage, maybe make all of the birds' eyes blink. All you'd need is a few pixels of black to cover the red up from time to time.
