Just a thought... I was looking through the screenshots up there ^^^ and I think we need to have all the wall tiles on the block overlay layer rather than the base layer. This would mean that particles will not sit on the top of the walls. Also it means if anything cuts over the wall at all it'll go under it rather than over it which should minimise the effect. I'll write a patchette for the editor so sort this, I think it will improve the look of the game.