Nice work you got there, especially with the updates you just made. It looks like it's going to be easy as Amy's pie in creating levels for sonic. Looking forward to it's results and the final product. One question though, does it utilize Sonic's momentum physics?
You should consider adding an option to use tiles instead of polygons, as sort of an "advanced mode". Although, that might be problematic considering how it seems like you handle drawing the polygons, as it looks like you directly render the slopes, instead of having separate images for the various slopes... Anyway, the reason why tiles would be useful as an option is because with polygons, if you draw two of the exact same shape, they'll always look exactly the same, but with tiles, you can manually edit and tweak certain parts of the geometry that the regular polygon algorithm wouldn't allow you to do. It'd be even better if you could make the two modes compatible with eachother, as then one would be able to use polygon mode to draw the general level design, then use the tile mode, or "detail mode", as it would probably be called, to tweak and change things just incase the polygon mode did something you didn't like for whatever reason.
I could easily go down this road but it would defeat the point of making things simple to edit. That would definitely make it easier to do more complex things, but that's not the end goal with this, I have to keep things simple at least for now. Polygons are not easily translated into tiles anyway. You can place decorations onto the stage, and their are some limited options for what graphics the polygon displays so that should suit people well enough. And nothing stops you combining many different polygons with different settings to effectively make one larger more complex shape.
If the mask editor is made really easy and intuitive/fast, it might work. You can probably keep using the original 256 collision masks that are 16*16 pixels, and make the outline out of that.
I think if people want to use chunks/tiles they should make a fangame the legit way haha All this will be is a 'make shapey levels and play'.
