I'm definitely interested in knowing how u did that event on the slopes!
In fact, i would like to see the whole capx (if u dont mind), because u have done a great job here.
Those regenerative walls are truly nice!
I guess it's for Fatal Revenge ?
Short version :
I first draw my level with tiles because it's way faster than drawing my level with actual sprites.
Then a loop replaces all the tiles by blocks sprites. During this, for each tile it tests for every other tiles in corners and replace some with slopes (as different sprite frames) if necessary.
[attachment=2:1fs2rpgn][/attachment:1fs2rpgn]
capx : [attachment=1:1fs2rpgn][/attachment:1fs2rpgn]
You'll need the platform+ behavior.
I also made little changes by adding slopes in inner angles (just the bottom ones, not the upper ones) since I uploaded the screenshot (click to view the full image) :
[attachment=0:1fs2rpgn][/attachment:1fs2rpgn]
It can still be improved to round single squares but it will need about 5 more frames and more events.