This is a great proof-of-concept! I have been thinking about making something like this too, with a basic drawing tool and html image maps, inspired by flickgame and flicksy. It's fun to see how you executed this!
I'm not sure what issues have already been reported, so I'll list the ones I found:
- The image importer's "preview" size does not seem to match the "final" size of the image (it looked like it would fit the window perfectly, but then was giant and a little blurry).
- If you shrink the image too much, it is top-left aligned. (It would be nice if it were centered, or draggable to position it by hand.)
- If you don't change the target scene in the gate editor (e.g. because you want it to go back to 0, which is selected by default), then the gate doesn't go anywhere.
- It's hard to place gate polygon points near the edge -- it'd be nice if there were a bit of buffer on the edge that accepted clicks, or really if the listener applied to the whole window and then just clipped the x & y coordinates to the nearest edge if they're outside the canvas area.
- It's hard to see the polygon points & fill on greyscale line-art (I was using exports from my submission to test). It might be nice to use two different-colored lines with filled circles when editing the gate polygons, and maybe a patterned or color-inverting fill for the gate polygons. Or maybe you could make the line & fill colors user-editable. Just some ideas.
On the whole, everything felt very intuitive for me (speaking as someone who has tried flickgame and flicksy and wanted to make something like this, at least. I would have no problem using a finished/bug-free version of this to make a game, and would be happy to do so.
(Also, I liked the "mood," it's fun to make it happy. Does it do anything other than change the "mood" text?)