When doing 2D I like to make it look a bit like 3D in a certain way, where the top tiles are drawn first so that the tiles under them are able to draw over them. For example, my main tile is 32x32, but its total area is 64x64, whereas it can intrude 16px into its neighboring tiles.
Is this possible to do using Defold’s Tilemap at all? I suppose I basically would like the option to have a negative margin.
If you split them you can draw the top parts in a layer above the bottom. Unfortunately the draw batching does not currently draw sprites in between layers in a tilemap but that is on the roadmap to fix. The (cumbersome) workaround is to move the top layer tiles to its own tilemap.